Rome

Rome is the capital of Italy and of the Lazio region, a city on the Tiber in the central-western part of the Italian Peninsula. It has about 2.8 million residents within its municipal limits and about 4.3 million in its metropolitan city, which makes it the most populous city in Italy and one of the largest in the European Union. Its historic centre is a UNESCO World Heritage Site, and the city is also the seat of the Holy See, whose enclave of Vatican City lies within its borders.

Rome's importance rests on a continuous urban history of roughly 2,800 years. Its legendary founding in 753 BC gave way to a republic and then to the Roman Empire, whose capital shaped law, language, engineering and political thought across Europe and the Mediterranean. After the empire's decline, the city became the centre of papal authority in the Christian West, was rebuilt in the Renaissance and Baroque periods, and in 1871 became the capital of unified Italy. Each phase left visible layers in the streets, monuments and institutions that the city still uses today.

This entry describes Rome's physical setting and origins, its development as a republican and imperial capital, its late antique decline and medieval papal period, its Renaissance and modern transformations, and its present-day population, governance, economy, urban fabric and cultural life. It closes with Rome's legacy and with the study of the city by historians and archaeologists.

Location and physical setting

Rome lies in the central-western part of the Italian Peninsula, inside the region of Lazio, which it serves as regional capital. The city stands on the banks of the Tiber, about 25 km from the Tyrrhenian coast at Ostia. The comune, formally Roma Capitale, covers about 1,287 km² and has roughly 2.7 million residents, which gives an average density of about 2,130 people per km². The surrounding Metropolitan City of Rome Capital is much larger, at about 5,363 km², and includes 121 municipalities. Much of that wider territory is farmland, hill country and natural land, so the dense urban core occupies only a fraction of the whole.

The ground beneath the city combines two contrasting materials. The first is a plateau of volcanic tuff, formed from ash erupted by the Alban Hills and the Sabatini volcanic fields. These eruptions deposited thick layers of ash, which compacted over time into tuff, a soft but durable rock. The Alban Hills lie about 30 km to the south-east and have been extinct for a long time, but they were active roughly half a million years ago. The second material is the alluvial floodplain of the Tiber, built from sands and muds that the river left when it overflowed its banks. The Aniene, the Tiber's main left-hand tributary, joins the river in northern Rome, and its valley extended the lowland area on that side of the city. This difference in ground type still matters today: during earthquakes, damage has been concentrated on the younger alluvial deposits of the centre, while the older tuff has generally provided a stable foundation for buildings.

The traditional "seven hills" are erosional remnants of this tuff plateau. Tributaries of the Tiber cut ravines and valleys between them, and these valleys were originally marshy. Much of the lower ground was later drained by the Romans, including the valley that became the Forum. The seven traditional hills are the Palatine, Capitoline, Aventine, Caelian, Esquiline, Quirinal and Viminal. The Janiculum, on the western bank of the Tiber, and the Vatican Hill and Pincian Hill lay outside the oldest boundary of the city and were not counted among the seven. The hills gave early settlers high, defensible ground above the floodplain, and the older pattern of valleys and slopes still influences the course of many present-day streets. Some north-south routes in the centre, for example, run over Tiber sediments, while a curving street on the east side may follow an old drainage line at the foot of the Esquiline.

The Tiber shaped the site in another way. The river rises in the Apennines and flows about 405 km through Tuscany, Umbria and Lazio before reaching the sea, and the city was founded on its eastern banks. Tiber Island, in the middle of the river, marked a ford that linked the eastern and western sides. Because the river was navigable for boats travelling upstream from its mouth, Rome could be supplied from the coast through Ostia while remaining some distance inland, which combined the security of a hill site with access to maritime trade. The surrounding Roman Campagna is a broad plain of volcanic and alluvial soils, and its Mediterranean climate, with hot dry summers and mild wet winters, completes the physical setting of the city.

Legendary and early origins

The founding legend and the date of 753 BC

Rome's traditional founding is dated to 21 April 753 BC. That date was fixed by the first-century BC scholar Marcus Terentius Varro, and the city still marks it as its birthday. In the story, the twins Romulus and Remus, born of Rhea Silvia and the god Mars, are abandoned on the Tiber and nursed by a she-wolf. Romulus later kills Remus after a quarrel and names the new settlement after himself. Historians treat this account as tradition rather than record. The earliest surviving written version of the myth dates from the late third century BC, long after the date that Roman writers assigned to the founding. Scholars also debate whether the twin story was part of the original myth or a later addition, and the surviving sources often contradict one another.

Archaeological evidence on the Palatine

The material evidence is older than the legend's written form, but it is less precise than the traditional date suggests. The most important finds come from the Palatine Hill. Three Iron Age dwellings cut into tufa rock were excavated in 1948 near the Temple of the Magna Mater. Their foundations show regularised bedrock, drainage channels, and post holes that once held wooden frames, with a central hearth inside. Nearby tombs from the 10th to 8th centuries BC suggest a burial area close to these early houses. Dating varies between sources: some place the huts in the 8th century BC, while others give a span running from the 10th to the mid-7th century. The huts seem to have been occupied until about the mid-7th century BC, after which no other domestic structures appear in the record until the later 6th century. This pattern points to a small village rather than a city, and the low ground between the hills, which later became the Forum, was marshy until it was drained in the late monarchic period.

Latins, Etruscans and Sabines

Early Rome was shaped by several neighbouring peoples. Its population was Latin in language and culture, and it took control of the wider region over time. Under king Tullus Hostilius, Rome conquered Alba Longa, the religious centre of the Latin people. Latin merchants had already built a village on the Palatine to trade with the Etruscans, who lived on the north bank of the river.

The Etruscan influence was strong. Although the Ciminian Forest separated Rome from Etruria proper, a line of Etruscan kings ruled Rome until 509 BC. Under these kings, major structures such as the Capitolium, the Cloaca Maxima and the Via Sacra were built. Tradition also credits Etruscan models with shaping Roman temple design, which favoured high podiums and a strongly frontal approach, and with introducing new engineering techniques and aspects of religious practice. The first Etruscan king, Tarquinius Priscus, adopted Etruscan royal insignia and drained the city's marshes. Historians stress that this influence was real but not total, since Rome was also shaped by Latin, Sabine and other Italic communities.

Sabine influence was equally significant. Two of Rome's first four kings, Numa Pompilius and Ancus Marcius, are traditionally described as of Sabine origin, and Numa is credited with founding many of Rome's religious institutions. Sabine lands lay along the route that brought salt from the Tiber mouth into the interior, which made them an important economic neighbour.

The Tiber crossing and the hills

The site's advantages were practical. Seven low hills rise on the left bank of the Tiber, and the river was shallow enough at this point to cross easily, which made it a natural meeting point for routes running between inland Latium and the coast. The river also provided a navigable waterway for trade. The Palatine and its neighbouring hills offered raised ground above the floodplain, and settlements spread across the other hills as the population grew. Over time these separate villages were joined into a single city, which is the process that formed the basis of Rome's later political life.

Kingdom and Roman Republic

Monarchy and the transition to the Republic

Tradition counts seven kings of Rome, and the last of them, Lucius Tarquinius Superbus, is remembered as a tyrant who disregarded the Senate. He was accused of putting senators to death and of neglecting to consult the Senate, which diminished both its size and its authority. In the standard narrative, his son's assault on the noblewoman Lucretia prompted noblemen led by Lucius Junius Brutus to expel the royal family around 509 BC. The Republic that followed replaced a king who had held office for life with magistrates chosen for short terms. Two chief magistrates, the consuls, were elected by the citizens for an annual term. Each consul could check the other, and their limited tenure made them answerable for abuses of power (built-in checks on authority, and the possibility of prosecution after their term). Power was shared among the consuls, the Senate and the popular assemblies, whose members were drawn from the citizen body. Senators were not elected; they were appointed by the consuls, and later by the censors. The 509 BC date is itself a traditional one, and the details of the early king list and the Lucretia story come from later accounts.

Patricians, plebeians and the written law

The early Republic was dominated by a hereditary elite. Initially, patricians held a monopoly on public offices, including the Senate and consulship, and even marriage between the classes was forbidden. The plebeians responded with a long campaign that historians call the Conflict of the Orders. Their main weapon was the withdrawal from the state, or secessio, which they used on perhaps as many as five or more critical occasions. The first secession, in 494 BC, was driven by debt. Sources disagree on where the plebeians withdrew to: one account places them on the Sacred Mountain (Mons Sacer), another on the Janiculum across the Tiber. The settlement created the office of tribune of the plebs, giving the plebeians political representation.

A second grievance concerned the law. Early Roman law was not published, and it was memorized and interpreted by patrician priests. In response to plebeian demands, a group of ten men known as the decemviri was appointed to record the law, and around 450 BCE they produced the Twelve Tables. These were displayed publicly in the Roman Forum. The code did not end inequality: it still heavily favored the Patricians, who retained their monopoly on religious and political positions. Its eleventh table even forbade intermarriage between the orders. The struggle continued until the Lex Hortensia of 287 BC, which made plebeian assembly decisions binding on all Romans. Patrician and plebeian families then blended into a new nobility that shared power at the top of Roman society. Historians also note that much of the plebeian rhetoric recorded by ancient writers was likely a later reconstruction.

Expansion across Italy and the Punic Wars

Rome's first major conquests were in central Italy. The Latin League that had once bound Rome to neighbouring cities was dissolved in 338 BC, after which Rome dominated the peninsula through alliances, colonies and military force. By the early third century BC, Rome was a rapidly expanding republic, though it was only a regional superpower, not a behemoth yet.

The contest with Carthage, a Phoenician-founded maritime power in North Africa, changed that. At the start of the war Carthage was the dominant power in the western Mediterranean, with an extensive maritime empire, while Rome was a rapidly expanding power in Italy, with a strong army but no navy. The First Punic War (264–241 BC) was fought mainly over Sicily and its waters. Rome built a fleet and won; the settlement gave Rome its first province outside the Italian peninsula. In 238 BC Rome also seized Sardinia and Corsica. The Second Punic War, during which Hannibal invaded Italy, ended with Rome as the leading power; Rome emerged as the dominant power, imposing harsh terms on Carthage. The Treaty of Zama of 202 BC stripped Carthage of territory outside Africa and reduced its navy. The Third Punic War (149–146 BC) ended with Carthage's destruction, after which the territory was annexed by Rome and transformed into the Roman province of Africa. Rome's control of the western Mediterranean was thereafter effectively unchallenged, and Romans called the sea "Mare Nostrum" ("our sea").

Civil wars and the late Republic

Overseas conquest brought wealth, slaves and political power, but it also strained the Republic's institutions. The agrarian reforms of the Gracchi in the 130s and 120s BC, the reorganisation of the army under Marius, and the Social War (91–88 BC), which extended citizenship to Italian allies, each widened the gap between the political class and the rest of the population. Rome's politics became increasingly violent. Sulla was named dictator in 82 BC, and Julius Caesar was named dictator for life in February 44 BC before his assassination in March of that year. A series of civil wars followed among rival generals and their armies, including Caesar's crossing of the Rubicon in 49 BC, the rival alliances of Pompey and Caesar, and the eventual struggle between Octavian and Mark Antony. The decisive Battle of Actium took place on 2 September 31 BC, and Octavian was later proclaimed Augustus.

For the city, these conflicts meant a larger and more volatile urban population. Veterans were settled on land seized from the poor, many rural smallholders migrated to Rome, and the grain distributed to the urban poor became a political instrument that generals used to win loyalty. Rome's streets saw organised gangs and armed clashes between rival factions. Such pressures explain why the struggle over the city's government and food supply became inseparable from the wars that ended the Republic.

Imperial capital

When Augustus assumed leadership over Rome, he saw a city that had been neglected for decades, falling into disrepair. His Principate, which began in 27 BC, kept Republican forms in place. Its institutions, including the Senate, the popular assemblies, the magistrates and the priesthood, were preserved, but by assuming several offices at once the princeps concentrated real power in his own hands. The city itself became one of the main instruments of this settlement. Augustus is said to have claimed that he had found Rome built of brick and left it clothed in marble, a boast that summarised a building programme of temples, theatres, aqueducts and civic spaces. Before Augustus, the aediles had controlled the city's public works and security, but that was to cease. Responsibility for these matters passed to the emperor's own administration.

Much of the new construction was religious or dynastic in character. Augustus built a number of new temples: one to Apollo on the Palatine, one to Jupiter on the Capitoline, and others to Minerva, Juno, and Jupiter on the Aventine. He also restored older monuments without attaching his own name to them, a choice that let him appear to be restoring the old republic rather than challenging it. The Altar of Peace, decreed by the Senate in 13 BCE to commemorate Augustus' safe return from campaigns in Spain and Gaul, and his mausoleum on the Campus Martius show how the emperor's family was written into the civic landscape. Practical works were part of the same programme. Two new aqueducts – Aqua Virgo and Aqua Julia – were built under the supervision of Agrippa. To protect against crime and fire, a fire brigade was created with seven cohorts of freedmen to protect against fire as well as to police the city.

The population of the imperial capital is debated. The conventional figure for the 1st and 2nd centuries CE is 1 million inhabitants. Glenn Storey has argued for a much lower number, based on house-by-house density data from Pompeii and Ostia, and puts the city at roughly 450,000 inhabitants. He points out that a million people within the roughly 13.86 km² of the ancient city would imply a density of about 72,150 per km², a figure he treats as implausibly high. Evidence from Augustus's own distributions to citizens supports a larger number. Counting adult male recipients and adding women and children, the calculation yields a Roman population of at least 675,000 cives, and once the garrison and non-citizens are included, the total approaches a million. Enslaved people formed a large part of this population, and freedmen and the urban poor made up much of the rest.

Food and public entertainment were central to order in the capital. Augustus made grain distribution to the poor more efficient, and the Augustan order is often summarised as providing grain and entertainment to keep the population content. The Circus Maximus, Rome's largest chariot racing stadium, was the setting for mass spectacle, while the Colosseum, begun under Vespasian and completed under Titus in AD 80, gave later emperors a larger arena for public shows. Managing the crowd was a matter of imperial responsibility, and the emperor's reputation depended on keeping the city fed and quiet.

The Great Fire of AD 64 tested that system. The city burned on 18 July AD 64. Tacitus says that Nero was at Antium on the coast when the fire began. He returned to Rome to organise relief efforts. Displaced residents were housed in public buildings and open spaces, and supplies of food were brought in from Ostia and other neighbouring towns and the price of corn was reduced. Accounts of the destruction vary, but one translation of Tacitus has only four of Rome's fourteen districts remained intact, while three were levelled. Rumours soon held that Nero had started the fire to clear land for himself. Tacitus was non-committal as to whether the disaster had occurred accidentally or had been treacherously contrived by the emperor. Nero blamed Christians, and the persecution that followed is treated in a later section.

The rebuilding turned the disaster into a programme of urban reform. Following the fire, Nero implemented new urban planning ideas, rebuilding streets and encouraging the construction of more fire-resistant buildings. Stone and brick increasingly replaced timber, and streets were widened. The emperor's own project, the Domus Aurea, was an extremely lavish palace, whose grounds covered approximately a square mile. Later emperors continued the pattern of building on a monumental scale, so that Rome's urban fabric increasingly displayed imperial power, as the Augustan regime had intended. The fire, the rebuilding and the urban growth of the capital all illustrate how closely the emperor and the city were linked in this period.

Late antiquity and decline

The third-century crisis left Rome more exposed than at any time since the Republic. In 271 the emperor Aurelian began a new circuit wall, a project of about 19 kilometres that reflected both the threat of raids into Italy and his need to assert control over the capital after a local revolt. The Aurelian Wall around Rome was begun in 271 by the emperor Aurelian; with a total length of 19,000 meters, its construction was a massive undertaking. A wall around Rome thus made military and political sense, but the huge size of the Aurelian Wall, and the path that it took, cannot be explained solely by military practicality. The structure stood about eight metres high and was reinforced with square towers at regular intervals. Its enclosed area was far smaller than the city of the early empire, which is widely estimated to have reached between 700,000 and 1,000,000 inhabitants in the first century CE. Early fifth-century emperors, notably Honorius, later strengthened the wall in response to fresh invasion threats. In the early fifth century, also a time of barbarian threats, the emperor Honorius augmented the Wall in order to protect the city against invaders.

Imperial power moved away from Rome well before the city was sacked. Constantine refounded the Greek city of Byzantium as Constantinople in 330, giving the East a new capital with its own senate and court. In the West, emperors preferred fortified northern Italian and Adriatic cities. Rome was no longer the capital of the Western Roman Empire, replaced in this position initially by Mediolanum and then later Ravenna. Rome kept enormous symbolic prestige, but it no longer hosted the court, and much of the elite patronage that had sustained its monuments and workshops went with it.

Rome was attacked three times in the fifth century. In August 410 the Visigoths under Alaric entered the city. The sack lasted for 3 days which resulted in virtually everything of value taken by the invaders. The event shocked contemporaries; Jerome wrote in Bethlehem that the city that had conquered the world had itself been taken. In 455 the Vandals under Gaiseric arrived by sea after the assassination of the emperor Valentinian III. Genseric took Valentinian III's widow, Licinia Eudoxia, and her two daughters, including Eudocia, as captives. The Vandal conquest of North Africa had already cut off a key source of revenue and grain for the city, a loss that the 455 sack made more severe. The Western imperial line ended in 476, when the general Odoacer deposed the teenage emperor Romulus Augustulus. That date is conventional rather than a dramatic event in Rome itself: there was no sack in 476, no flames, no tidal wave of chaotic destruction. The Eastern empire continued, and the city's administration gradually passed to bishops and local elites.

The most destructive phase came in the sixth century, during the Gothic War between the Ostrogothic kingdom and Justinian's Byzantine forces, which began in 535. Rome changed hands several times. In 537–538 the Ostrogothic king Vitiges besieged the city; the Goths established fortified camps around Rome and attempted to cut its water supply. The siege also cut off the port at Portus, and food shortages and disease increasingly affected the population. A second siege followed in 545–546 under Totila. The Goths partially dismantled Rome's walls before withdrawing, and the city was taken and then retaken in the course of the war. Repeated sieges disrupted the aqueducts that had supplied the city's baths, fountains and mills, and many public buildings fell into disrepair. Plague, which reached Italy in the same decades, added to the losses.

Taken together, these developments caused a collapse in population. Rome had probably been one of the largest cities in the world at its height, but by the second half of the sixth century the population had fallen to a small fraction of that figure. During this period, the city of Rome experienced a decline of population from around a million persons to about 30,000. The figures for intermediate periods remain uncertain. The settled area contracted towards the Campus Martius, the Tiber bank, and the areas around the major churches, while the ancient fora and many districts beyond the old centre were left largely empty. This transformation laid the groundwork for the papal city of the early Middle Ages, in which the Church and its bishops took on roles once held by the imperial administration.

Papal Rome and the medieval city

The bishop of Rome gained a distinctive standing because the city was linked with the martyrdoms of Saints Peter and Paul. After the Western imperial court moved away and the western provinces fragmented, the bishops of Rome became the most prominent authorities in the city. Leo I (440–461) asserted a primacy over other western bishops, and Gregory I (590–604) took on civic duties that had once belonged to imperial officials: he organised the distribution of grain, arranged the city's defence and conducted negotiations with the Lombards. Imperial authority from Constantinople remained nominal, but it was distant and often unable to protect Rome, so the papacy's temporal role grew out of practical necessity.

The city's religious economy rested on its martyr shrines. Under Constantine, basilicas were built over the tombs of Peter on the Vatican hill and of Paul on the Via Ostiensis, and the Lateran basilica became the cathedral of the bishop of Rome. Catacombs and shrines attracted pilgrims from across Western Christendom, who brought donations, lodging income and trade. Guides and pilgrim itineraries described the holy sites, and the basilicas were repeatedly repaired, enlarged and decorated. Boniface VIII proclaimed the first Jubilee in 1300, which made the pilgrimage to Rome a recurring event. The Lateran palace suffered a severe fire in 1308, a reminder of how much the papal complex depended on maintenance that the city could not always afford.

The papacy's territorial power took shape in the eighth century. When the Lombards threatened Rome, Pope Stephen II sought Frankish help, and the Frankish king Pepin III intervened in Italy and granted former Byzantine and Lombard territories to the papacy in the 750s. Charlemagne defeated the Lombards in 774, confirmed these arrangements, and was crowned emperor by Pope Leo III in St Peter's on Christmas Day 800. This papal-Frankish partnership laid the foundation of the Papal States, which became a long-lived secular state in central Italy. Later claims to these lands were sometimes supported by the Donation of Constantine, a forged document that Lorenzo Valla exposed in the fifteenth century.

Medieval Rome was far smaller than its imperial predecessor, and its population was a small fraction of the imperial peak. Ancient monuments were quarried for building materials and lime, and open spaces were used for farming and grazing. Powerful aristocratic families, such as the Colonna and the Orsini, competed for control of the city and its churches. In 1084, Norman forces under Robert Guiscard, called in by Pope Gregory VII, sacked much of the city after a conflict with the Holy Roman Emperor Henry IV. Civic republican experiments, such as the brief tribunate of Cola di Rienzo in 1347, reflected the city's political instability.

In 1309, under pressure from the French crown, Clement V moved the papal court to Avignon, and it stayed there under a succession of French popes. The Avignon period reduced the revenues and prestige of Rome, and its churches and palaces decayed further. Gregory XI returned the papacy to Rome in January 1377, but his death in 1378 led to the Western Schism, in which rival popes claimed authority from Rome and Avignon until 1417. Rome's recovery began under Martin V, who restored the papal presence and the city's administration. That revival set the stage for the fifteenth-century patronage that would define the Renaissance city.

Renaissance and Baroque transformation

The papacy's return to Rome in the fifteenth century turned the city into one of Europe's leading centres of humanist learning and large-scale building. Renaissance popes inherited a city that had lost much of its population and infrastructure during the Avignon period. Nicholas V (reigned 1447–1455) is generally regarded as the first pope to plan Rome systematically. He repaired the failing fabric of Old St Peter's, had the Vatican palace rebuilt, enclosed the papal precinct with a wall, and commissioned designs for a new basilica from Leon Battista Alberti and Bernardo Rossellino. His court employed humanists who copied and translated Greek and Latin authors. He also wanted a public library for scholars, and although he died before completing it, the institution that became the Vatican Library was established under his successor Sixtus IV in 1475.

Papal patronage and the Vatican

Julius II (reigned 1503–1513) pursued the reconstruction of St Peter's on a far larger scale. In 1505 he resolved to demolish the ancient basilica and replace it with a monumental church that would house his own tomb, which was to be decorated by Michelangelo. Work began in April 1506, and the design passed through several architects, with Donato Bramante's original scheme giving way to later revisions by Antonio da Sangallo, Michelangelo and Carlo Maderno. The building was not finished until 1626. Julius also expanded the Vatican palace complex and commissioned Bramante to link the Belvedere Palace with the main residence, creating a sequence of courtyards that housed the papal collection of ancient statues. The Laocoön group, unearthed near Santa Maria Maggiore in 1506, was among the first major antiquities to enter that collection.

Earlier, the Sistine Chapel had been built between 1473 and 1481 for Sixtus IV, but its interior decoration gained its international reputation under Julius II and his successors. Michelangelo painted the ceiling between 1508 and 1512 and returned to the chapel to paint the Last Judgment between 1533 and 1541. Raphael decorated several rooms of the papal apartments, the Stanze, in the same period. These commissions made the Vatican the focal point of High Renaissance art in Rome, and they drew painters, sculptors and architects from Florence, Lombardy and beyond.

Crisis and the urban plan of Sixtus V

The sack of Rome in 1527 by the troops of Holy Roman Emperor Charles V ended the city's position as the leading Renaissance centre. Thousands of churches, palaces and houses were looted, and many artists dispersed. The Counter-Reformation papacy nonetheless recovered, and the late sixteenth century brought a systematic programme of urban planning under Sixtus V (1585–1590), who worked with the architect Domenico Fontana. Sixtus restored an ancient aqueduct to supply the high ground that residents had abandoned for lack of water; the renamed Aqua Felice later fed many of the city's new fountains. He also completed the dome of St Peter's, rebuilt the papal palaces at the Vatican, the Quirinal and the Lateran, and moved ancient obelisks to new sites in front of major churches. Straight avenues were cut through the medieval street pattern to link the principal pilgrimage churches and to create long vistas terminating in monuments. Sixtus's plan gave Rome much of the axial layout that its later Baroque designers would extend.

Baroque design under Bernini and Borromini

In the seventeenth century, Gian Lorenzo Bernini and Francesco Borromini transformed the city's public spaces. Bernini's Triton Fountain in Piazza Barberini was commissioned in 1642 by Pope Urban VIII of the Barberini family, and it was the first freestanding public fountain he designed in Rome. In Piazza Navona, which occupies the site of the ancient Stadium of Domitian, Innocent X of the Pamphili family commissioned the Fontana dei Quattro Fiumi, built between 1647 and 1651. Its personifications of four rivers support an Egyptian obelisk, an arrangement that combined sculpture, hydraulic display and the reuse of antiquity. Borromini, who was Bernini's rival, designed the church of Sant'Agnese in Agone on the same piazza, and his work at San Carlo alle Quattro Fontane and Sant'Ivo alla Sapienza used curved, sculpted surfaces that contrasted with Bernini's more theatrical approach. Their competing designs gave the city's churches and squares a distinctive sense of movement and drama.

Antiquarian study and the classical collection

Rome's Renaissance and Baroque culture was closely tied to the study of its ancient remains. Humanist antiquarians mapped the ruins, compared ancient texts with surviving monuments, and encouraged collectors to acquire classical sculpture. The discovery of works such as the Laocoön and the Apollo Belvedere, and their display in the Vatican, made Rome the reference point for European ideas about ancient art. Popes, cardinals and aristocratic families assembled their own collections of antiquities, which were copied by artists and sold across Europe. This practice shaped the taste of later European patrons and established the classical sculpture of Rome as a model for the academies that trained artists in the following centuries.

Capital of unified Italy

Rome became the national capital through a sequence of political and military events rather than by a planned decision. After Turin and then Florence served as temporary seats of government, the city was taken from papal rule in 1870. Rome remained under papal rule and was protected by French troops, so Florence emerged as an intermediate solution during one of the most delicate phases of Italian unification. Before Rome, Turin and Florence each held the title.

The decisive change came in the Franco-Prussian War. In early August 1870, Napoleon III recalled his garrison from Rome, leaving what remained of the Papal States without protection. The Italian army reached the Aurelian Walls on 19 September and placed the city under siege. On 20 September, after a cannonade of three hours had breached the walls at Porta Pia, the Bersaglieri entered the city. Pius IX had allowed a token resistance so that the takeover would not appear freely accepted. After a plebiscite held on 2 October 1870, Rome was officially made capital of Italy on 3 February 1871, completing the unification of Italy. Other sources give different dates for the formal transfer. One timeline places the official move of the capital from Florence to Rome in June 1871, while another describes Victor Emmanuel II's solemn entry into the city in 1871 and his settling in the Quirinale.

The Quirinal Palace, previously the papal residence, became the royal palace. The Pope withdrew in protest into the Vatican, where he lived as a self-proclaimed "prisoner", forbidding Catholics under pain of excommunication to take part in elections in the new Italian state. The new state also had to adapt the existing urban fabric for its institutions. Parliament, ministries and administrative offices were housed in older palaces and newly built structures, which made the historic centre the seat of government. Planning was led by officials from Piedmont, the origin of the Savoy monarchy, who drew on their experience of administering Turin. Their work included new government buildings and the first residential districts laid out on the edges of the old core.

Growth beyond the old boundaries followed quickly. The population was about 194,500 in 1861, and the arrival of officials, civil servants, military personnel and migrants from the provinces more than doubled it within a few decades. The Papal-era city had been compact and largely confined inside the Aurelian Walls, and the new demand for housing pushed development onto the open land beyond them. Districts such as the Esquiline, Castro Pretorio and Ludovisi were built on former gardens and vineyards, and the building boom was often driven by speculative companies. The Aurelian Walls were pierced and partly demolished in places, and the Porta Pia breach itself was later commemorated by a monument, which indicates how central the event was to the city's new identity.

The status of the papacy remained unresolved for six decades. With the completed unification of Italy in 1870, the papacy objected to the Italian seizure of Rome and the Papal States. The conflict was ended in 1929 by the Lateran Treaty, which created Vatican City and resolved the dispute. The treaty was one of the Lateran Pacts of 1929, agreements between the Kingdom of Italy and the Holy See, ratified on June 7, 1929, ending the "Roman Question". The treaty consisted of three components: a diplomatic accord recognising the Vatican's sovereignty, a financial settlement compensating the papacy for its lost territories, and a concordat defining the relationship between the Catholic Church and the Italian government. Because of this settlement, the Italian capital contains a sovereign enclave, which is one reason the city is unusual among European capitals.

Fascism, war and postwar growth

The Fascist period changed Rome's physical form more than any era since the papal city of the Baroque. After Benito Mussolini's party came to power following the 1922 March on Rome, the regime treated the ancient past as a political resource. Between 1924 and 1932, a broad avenue was cut from Piazza Venezia toward the Colosseum, initially named Via dell'Impero. Building it required displacing thousands of residents from a densely populated area, demolishing churches and other buildings, and burying part of the imperial fora. The road was inaugurated in 1932, the tenth anniversary of the March on Rome, and was used for military parades. It was renamed Via dei Fori Imperiali after the war. The same logic shaped urban planning elsewhere: the regime's ambition was to link the monuments of imperial Rome to the symbols of the new state.

The regime also planned new districts. EUR, an abbreviation for the Esposizione Universale Roma, was built as the site of a world's fair scheduled for 1942, which was cancelled due to World War II. The neighbourhood was completed after 1945 and converted largely into a residential district. Living there became a marker of status, and part of the upper middle class left northern Rome to move south, marking a small revolution in the capital's social geography. Cinecittà, the film complex in the south-east of the city, followed a similar propaganda logic. It was founded in 1937 after a fire destroyed the earlier Cines studios, and it was meant to compete with Hollywood as a national production centre.

Rome's relationship with fascism and the Second World War changed abruptly in 1943. Following the wishes of the Pope, the Badoglio government declared Rome an open city, a demilitarised zone that the Allies refused to recognise and the Germans did not respect. German forces entered the city in September 1943 after the king had left, and the occupation was led by commanders including Nazi SS officer Herbert Kappler, who ran the city's security. The occupation brought repression on several levels. On 16 October 1943 German forces carried out a raid on the Jewish ghetto. In total, a quarter of the Jewish population of Rome—over 2,000 people—was deported, of which only 102 survived the Holocaust. See the Holocaust for the wider context.

The most notorious reprisal was the Fosse Ardeatine massacre. On 24 March 1944 German forces killed 335 civilians and political prisoners in Rome as a reprisal for the Via Rasella attack by Italian partisans against the SS Police Regiment Bozen the previous day. The victims were shot in disused pozzolana quarries on the city's outskirts. After the war the site became a national memorial. Partisan activity continued until the Allies approached. Sources differ slightly on the exact date of liberation. One account states that the liberation of Rome from German occupation in World War II was carried out on June 3–4, 1944 by American and British troops, while another gives the night of 4–5 June. Rome was the first of the three Axis capitals to fall to the Allies, followed by Berlin and Tokyo.

Postwar reconstruction began amid severe shortages. Cinecittà was damaged by Allied bombing and after the war the Allies used Cinecittà as a prisoner-of-war camp and then as a displaced-person camp. The closure of the studios encouraged neorealist filmmakers to shoot on location in the streets, a development associated with directors such as Roberto Rossellini and Vittorio De Sica. The studios were rebuilt, and attracted by production subsidies and low labour costs, American studios shot films there, earning Cinecittà the nickname of "Hollywood on the Tiber." The city's administrative and public-sector role also grew, as the national state expanded its ministries and agencies in the capital. Rome became the seat of the European integration project when the Treaties of Rome, signed in 1957, established the European Economic Community.

Rapid demographic change shaped the outskirts of the city in the 1950s and 1960s. Rural families from the Lazio countryside and from southern Italy arrived in search of work, and the housing supply could not keep pace with them. Many newcomers built or occupied dwellings in informal settlements on the periphery, known as borgate, and unauthorised construction spread across areas outside the planned城市 fabric. Municipal and state authorities responded with new public housing projects and infrastructure, but services such as roads, water and transport often lagged behind the settlements. The expansion of the Metro from Termini station in the 1950s was one of the first major efforts to connect these growing districts to the centre. These processes laid the foundations for the sprawling urbanisation and the demographic patterns that defined the city in later decades.

Population and demographic change

Rome grew from a small base after Italian unification. The city had about 194,500 inhabitants in 1861 and passed 2.7 million by the 1970s. Its municipal population peaked around 1981, at 2,805,109 in the census of that year. It then fell to a low of 2,546,804 in 2001, recovered to 2,749,031 by 2021, and stood at about 2.75 million in the latest official count, for 1 January 2025. Postwar growth was driven largely by migration from the countryside and the expansion of new districts beyond the historic core.

The municipal figures differ sharply from those of the wider Metropolitan City of Rome, which had 3,695,961 residents in 1981 and 4,223,885 in 2025. The metropolitan total barely moved between 1981 and 2001, then rose to about 4.0 million in 2011 and 4.2 million in 2021. Residents who moved out of the comune into surrounding municipalities account for much of this gap. Internal mobility is the component that determines when a city's growth turns into decline. Rome's trend follows the national pattern of demographic change, but with a delayed transition to decline and a slower pace of loss than Italy as a whole.

Foreign residents now form a significant part of the population. As of 1 January 2025, about 354,086 residents, or roughly 12.9 per cent, held foreign citizenship. The largest groups came from Romania (about 71,700), the Philippines (about 37,500), Bangladesh (about 35,100), China (about 17,600), Ukraine (about 15,800), Peru and India. Migration from Eastern Europe, South Asia and East Asia therefore appears alongside substantial communities from Africa, including Egypt, Nigeria and Morocco. Demographic analysis finds that international migration remains consistently positive, while natural change has become structurally negative. Rome's population also has a more diverse age structure and a higher level of internationalisation than many other large Italian cities, although it has a notably small child population.

These trends sit within a national context of contraction. Italy's population fell to 58.93 million in 2024, and births that year, at about 370,000, were the lowest since unification. The fertility rate reached a record low of 1.18 children per woman. Urban pressure in Rome therefore comes from a combination of high density, a steady inflow of newcomers and an ageing resident base, rather than from rapid natural growth. Density is about 2,130 residents per square kilometre within the municipal boundary, but it varies considerably between the historic centre and the outer districts, which form fifteen administrative subdivisions with distinct demographic profiles. Household size and housing costs differ across these areas, and urban planning in the historic centre must manage this unevenly distributed pressure.

Government and administrative status

Rome's administration works through several overlapping layers, each with its own legal basis: the municipality, the regional and metropolitan tiers above it, the national state that sits in the city, and the Holy See's extraterritorial properties. These layers do not form a single hierarchy, and some of their boundaries differ.

At the base is Roma Capitale. Italian legislation of 2010 gave the municipality a special form whose territory matches the former comune, with statutory, administrative and financial autonomy justified by the city's role as national capital. Nel 2010 il Comune di Roma diventa Roma Capitale, un ente speciale unico che coincide territorialmente con i confini del Comune di Roma. The enabling decree is the legislative decree of 2010 n. 156 del 2010, which was followed by further steps to harmonise the system. English-language references date the status to 2009, when Rome became a comune speciale, so sources differ on the starting point. The city's own statute later redefined the municipi, which passed from nineteen to fifteen. Each of the fifteen municipi has its own president and council.

The executive and legislative organs are the mayor and the city council. The mayor is elected for a term of five years, renewable once, and the mayor and council together handle the city's strategic government. The council, known as the Assemblea Capitolina, has 48 seats and is the top legislative body of the city, meeting at the Palazzo Senatorio on the Capitoline Hill. The office is held by Roberto Gualtieri of the Democratic Party, who won the 2021 runoff against the centre-right candidate. The next council election is due between 15 April and 15 June 2027, and Gualtieri has said he intends to run again in the next municipal elections in 2027.

Above the city sits the Lazio region, and the Metropolitan City of Rome Capital is a local government layer at the metropolitan level. It was established on 1 January 2015 and superseded the province of Rome. It covers the city and 120 other comuni in the hinterland. The municipality occupies only part of this territory, so the metropolitan area extends well beyond the city's administrative boundaries.

Rome is also the seat of the national state. The Italian Republic's presidency, the two chambers of Parliament, the prime minister's office and the national ministries are all located in the city, which makes it the centre of a unitary state with a parliamentary system of government.

The Vatican represents a separate sovereign arrangement within the city. The Lateran Treaty, resolved on February 11, 1929, between the Kingdom of Italy and the Holy See, established the independence of Vatican City State. Vatican City is an enclave in Rome and is the smallest sovereign state in the world. The rights under the treaty belong to the Holy See rather than to the state itself. Beyond the territorial boundary of Vatican City, the Lateran Treaty of 1929 grants the Holy See extraterritorial authority over 23 sites in Rome, including major basilicas and offices. These properties enjoy so-called "extraterritorial" rights recognised by international law, like embassies, and public order in them is the responsibility of the Vatican Gendarmerie. Because the Holy See conducts diplomacy on its own behalf, foreign envoys are accredited to the Holy See rather than to Vatican City.

Economy and tourism

Rome's economy is built mainly on services. Estimates of output by sector put services at close to half, industry at about 35 per cent, public administration at roughly 13 per cent and agriculture at around 4 per cent. The weight of public administration follows from the city's role as the seat of the state. One breakdown puts public employment at about a quarter of the city's workers, with central government agencies taking the largest share of that group.

Large private firms are split between Rome and Milan. UniCredit keeps its registered office in Rome, while its general management operates from Milan. Energy group Eni adds a major oil and gas presence to the capital's corporate base. Milan nevertheless remains Italy's principal financial centre, so Rome's economic profile rests more on government, culture and tourism than on banking.

Tourism is the most visible of these sectors. Rome is the leading Italian municipality for the added value generated by tourism, with a 2024 figure of about €13.3 billion. That total was €8.5 billion in 2022, according to Il Sole 24 Ore's sociometric research. The same study places Milan at about €4.7 billion, followed by Venice at €3.4 billion, Florence at €3 billion, and Rimini and Naples at around €1.5 billion each. The sector also supports employment, with more than 100,000 people working in it.

Visitor flows are concentrated around a small number of monuments and religious sites. International tourist arrivals in Rome exceeded eight million in 2024, an all-time high. Over the same period, international overnight stays grew by more than 40 percent compared with 2019, while domestic arrivals stayed below pre-pandemic levels. Attendance at the Colosseum is reported at almost 15 million for 2024, but admission to the Colosseum, Roman Forum and Palatine Hill is sold on one ticket, so figures are recorded collectively for the three sites. Visitor numbers also rise in Holy Years, when arrivals sometimes double on top of a baseline of 7 to 10 million tourists a year.

The COVID-19 pandemic exposed how heavily the city depended on visitors. An Italian trade association's 2020 study forecast a reduction of 9.9 million tourists and 2,300 million euros less in revenue for Rome. Another estimate records visitor numbers falling from 19.5 million in 2019 to 4.1 million in 2020, with spending dropping from €10.5 billion in 2019 to €1.5 billion in 2020. The capital's losses were steeper than the national average, with a 80% decrease in tourism visits in 2021 for the capital, against 36% for the rest of Italy. International arrivals in 2021 were 1.6 million, higher than 2020 but still almost 80% lower than pre-pandemic figures.

Outside tourism, the city's cultural and media economy carries particular weight. Universities, national radio and television, and the movie industry are also important parts of the economy. The Cinecittà studio complex on the city's southeast side remains a focal point for film and television production, and it links Rome to the international film trade. Fashion is another significant sector, alongside a sizeable agricultural sector.

Rome's standing as a global city therefore depends on the measure used. It ranks strongly as a seat of national government, a destination for visitors and a centre of cultural production, but it trails Milan in finance and corporate headquarters. Comparisons with Naples and the other large Italian cities tend to favour Rome on tourism revenue and administrative functions, while Milan generally leads on business services and corporate networks.

Urban form, rioni and the historic centre

The rioni are the traditional districts of the historic centre. Rione is an Italian term used since the 14th century to name a district of a town. The word derives from the Latin regio, and during the Middle Ages the Latin word became rejones, from which rione comes. The system's roots lie in antiquity. Tradition credits Servius Tullius with dividing the city into four regiones, and the first emperor Augustus created the 14 regiones of Rome that were to remain in effect throughout the Imperial era. Only Transtiberim, the area of modern Trastevere, lay on the right bank of the Tiber.

The number of districts then changed with the city's fortunes. Sources disagree on the medieval sequence. One states that after the fall of the Roman Empire and the decline of the city, the population decreased, and in the 12th century, it was divided into 12 regiones, while another says the limits became more official in the 13th century, when their number rose to 13 and remained the same until the 16th century. In either account, the boundaries stayed uncertain, and the rione was not a political entity, but only an administrative one. Each was headed by a caporione, supported by sworn local constables for public order.

Papal government fixed the final form. At the end of the 16th century, Pope Sixtus V carried out an intense reorganization of the city with new streets and fountains, and the regiones became 14 with the addition of the Borgo district. Other sources credit Benedict XIV (1740–58) with the marble tablets that still mark the districts, and the number of rioni remained unchanged until 1871. Borgo itself had long been outside the sacred boundary of the early city: since it lay outside the Pomerium and was plagued by malaria, this territory was used as a burial place, and in the Roman period it was known as the Ager Vaticanus.

The rioni map onto distinct historical layers. The Campus Martius, a flat area on the left bank, was densely built with monuments. In addition to the Column of Marcus Aurelius, from which the rione takes its name, the Temple of Hadrian and the Solarium Augusti were located in the area. In the early modern period, Pope Alexander VII refurbished Piazza Colonna and his family bought the palace that overlooked it. Trastevere, across the river, kept a separate character. Settlement patterns also shifted over time: urbanization followed the people, and next to the river the rione was full of buildings while almost nothing was built on the hills until the Renaissance. The Quirinal later became a seat of papal power and, in 1811, was selected to be the center of the imperial power in Rome under Napoleon.

The Aurelian Walls defined the outer limit of the historic core for many centuries. The Aurelian Walls were erected by Emperor Aurelian between 271 and 275. The circuit ran for 19 kilometres (12 mi) surrounding an area of 13.7 square kilometres (5.3 sq mi), and enclosed all the seven hills of Rome plus the Campus Martius and, on the right bank of the Tiber, the Trastevere district. The walls kept their military role until September 20, 1870, when the Bersaglieri of the Kingdom of Italy breached the wall near the Porta Pia and captured Rome. Afterwards, the walls, which by then had lost their defensive function, were partly demolished and fragmented to allow the opening of pedestrian and vehicular passages between the Historic Centre and the new neighbourhoods announced by the 1883 Regulatory Plan. The first building activities on the new allotments outside the Aurelian walls began outside Porta Pia and Porta Salaria as early as the last two decades of the 19th century. Today the surviving circuit is much shorter than the original, and the walls still mark the boundary of the historic centre.

The management of the historic centre is shaped by its World Heritage status. The historic centre, meeting five of the ten criteria, was inscribed on the UNESCO World Heritage List in 1980, and the protected zone was then expanded in 1990 to include the walls of Urban VIII, certain extraterritorial properties of the Holy See, and the Basilica of Saint Paul Outside the Walls. Defining the western boundary has itself been a technical question, since the 1980 evaluation included only an outline sketch of the limit. Practical planning problems are also significant. Ancient remains lie under modern streets and buildings, and many structures that were buried have been uncovered by archaeologists and are visible today as ruins in the basements of buildings, in traffic roundabouts, on the sides of streets or left exposed in designated archaeological zones. Authorities must therefore reconcile excavation, conservation, traffic circulation and the daily needs of residents within a dense historic fabric.

Transport, infrastructure and environment

Water supply and aqueducts

Rome's water system began with the aqueducts. The Aqua Appia, built from 312 BC, was the first of eleven aqueducts constructed over roughly five centuries. Some ran tens of kilometres from springs in the surrounding hills, and they were gravity-fed, using carefully graded channels rather than pumps. During the imperial period the city's daily supply may have reached about one million cubic metres. Most of the channels fell out of use after late antiquity. By the late medieval period the Aqua Virgo was reportedly the only one still working, and it still feeds the Trevi Fountain.

Today the network is run by Acea, which manages the water cycle across Rome and neighbouring provinces. Leakage is the central weakness. During the 2017 drought, losses from the pipes approached half of the water entering them. To compensate, Acea drew down Lake Bracciano, a volcanic lake that serves as an emergency reserve and a regional nature park. The lake's ecosystem has not fully recovered, and the company faces criminal charges over the environmental damage. The city's street fountains, the nasoni, run continuously. They account for under one per cent of total supply, but they keep water moving in the pipes, which limits stagnation, and they serve as ventilation points for the network. Since 2015, modern "water houses" have dispensed filtered tap water in the centre.

The long-term question is whether the city can secure enough water while cutting losses and adapting to a warmer, drier climate, and whether it can rely on groundwater and springs that are now under pressure.

Rail, metro and airports

The Rome Metro opened in 1955 and is the oldest metro system in Italy. Its three lines, A, B (with the B1 branch) and C, cover roughly 60 to 62 km and 73 to 77 stations, depending on the source. Line A runs diagonally from Battistini in the northwest to Anagnina in the southeast. Lines A and B meet at Termini, the central railway station, while Line C is fully automated. Its western terminus was moved to Colosseo in December 2025, where it connects with Line B. Pre-pandemic daily ridership was about 820,000. Tunnelling has repeatedly uncovered ancient remains, and at Porta Metronia the remains of a Praetorian barracks are displayed in situ inside the station.

The metro is only one layer of the network. Six tram lines cover about 36 km, and the regional FL lines run as rapid transit through the city. The Leonardo Express links Termini with Fiumicino Airport. The Rome–Lido line, branded Metromare, runs 28.3 km to the coastal district of Ostia and carries around 90,000 passengers a day. Termini remains the principal interchange for the whole system.

The Leonardo da Vinci–Fiumicino Airport is Italy's busiest. It exceeded 50 million passengers for the first time in 2025, with one operator-linked report giving 51.3 million and another 50.9 million, so the exact figure varies by source. Its network reaches about 240 destinations, and it serves as a long-haul hub. The operator's plan to 2046 includes a new terminal and a fourth runway, with capacity for around 100 million passengers a year. Ciampino serves as the secondary airport.

Rivers, flooding and green space

The Tiber has long threatened the low-lying districts along its banks. After the severe flood of 1870, the city built the massive riverside embankments (muraglioni) between the 1870s and the 1920s, which now separate the river from much of the urban fabric. Modern river management focuses on flood control, water quality and public access to the riverbanks.

Green space is unevenly distributed. Large historic parks such as Villa Borghese and Villa Doria Pamphili sit within the city, while the Appian Way Regional Park and the Castelporziano estate on the coast extend the green belt beyond the built area. These areas provide habitats and recreation but are often remote from the dense central districts.

Climate, heat and urban planning

Rome has a Mediterranean climate with hot, dry summers and mild, wet winters. Summer heatwaves regularly push afternoon temperatures well above 30°C. Dense masonry, asphalt and reduced tree cover create an urban heat island effect, which raises nighttime temperatures in the centre and increases the health risks for elderly and vulnerable residents. It also drives electricity demand for air conditioning, placing stress on the electrical grid. Planners have responded with tree planting, shading, cool-roof measures and efforts to reduce car traffic, while the same climate pressures add urgency to the question of water supply.

Monuments and archaeological sites

The core ancient monuments of Rome cluster between the Palatine, the Capitoline and the Esquiline, and they record how building techniques and civic functions changed over about a thousand years. Most were built from tuff, travertine, marble and brick-faced Roman concrete. Many were later quarried, reused or converted, so much of the ancient city survives as fragments inside later buildings.

The Colosseum, the Forum and the Palatine

The Colosseum (Flavian Amphitheatre) was begun under Vespasian around AD 70–72 on the drained artificial lake of Nero's Domus Aurea, a deliberate gesture of returning the land to public use. Its exterior used about 100,000 cubic metres of travertine, quarried at Tivoli, while the interior relied on concrete, tuff and brick. The travertine blocks were fitted without mortar and held by iron clamps. Its load was carried by a ring of interlocking arches and vaults, which allowed a freestanding design instead of the hillside seating typical of earlier Greek theatres. Titus opened it in AD 80, and Domitian added upper levels and the underground hypogeum, where animals, scenery and lifting machinery were housed. Vaulted stairways and exit passages, the vomitoria, moved large crowds in and out, while seating was arranged by social rank. After antiquity the building was used as a quarry, a fortified residence for medieval families and a source of stone for churches and palaces.

The Roman Forum occupied the valley between the Palatine and the Capitoline and served as the political, judicial and commercial centre of the Republic and the Empire. The Curia, the Rostra and basilicas such as the Basilica Julia were rebuilt several times, often after fires, and their surfaces were updated in marble as fashions changed. The Forum therefore reads as a layered site rather than a single plan. Its function moved from open marketplace and assembly ground to a ceremonial setting for honours and triumphs. In the Middle Ages it was partly stripped for building material and used as pasture. The Palatine, traditionally the site of the earliest settlement, carried imperial residences from the late Republic onward. Augustus' house and the later palace complexes of the Flavian emperors gave the hill's name to the word "palace" in several modern languages.

The Pantheon and imperial civic architecture

The present Pantheon was preceded by a temple built by Marcus Agrippa in 27–25 BC. Hadrian rebuilt the temple between about AD 118 and 125. Brick-stamp evidence supports this later date, and Hadrian kept Agrippa's dedicatory inscription, in keeping with his habit of not placing his own name on his works. The building's concrete dome has an interior diameter of about 43 metres, equal to its height from floor to the oculus, so the interior forms a sphere. The dome's wall thickness drops from roughly six metres at the base to about two metres near the top. Its aggregate also changes from heavy travertine to light pumice as the dome rises. The dome is widely described as the largest unreinforced concrete dome in the world. In 609, the building was consecrated as the church of Santa Maria ad Martyres, a transfer traditionally linked to Pope Boniface IV and the Byzantine emperor Phocas. This conversion, which moved martyrs' remains into the building, explains why the Pantheon has remained in continuous religious use.

Trajan's Forum, completed in the early second century AD under the design of the architect Apollodorus of Damascus, shows how imperial architecture combined public ceremony with commerce. The forum included a basilica, libraries and the spiral-relief Trajan's Column. Behind it, Trajan's Markets were built into the slope of the Quirinal as a multi-level complex of vaulted shops, offices and administrative rooms. The complex was an early example of large-scale urban retail and government architecture.

Renaissance and Baroque monuments and the ancient street plan

Later rulers frequently built over, or along, ancient routes and reused ancient materials. The Trevi Fountain, designed by Nicola Salvi and completed in 1762, marks the terminus of the Aqua Virgo, an aqueduct built in 19 BC, and it stands where several streets meet. Bernini's colonnade for St Peter's Square, built in the 1650s and 1660s, frames a space that sits over the area of Nero's circus and the early Christian cemetery. The Egyptian obelisk at its centre was originally erected in the circus and was moved in 1586 under Sixtus V. In the 1930s, the Via della Conciliazione cut a straight avenue through the medieval Borgo, aligning the approach to St Peter's with Hadrian's Bridge and the Castel Sant'Angelo.

Excavation beneath modern Rome

The Domus Aurea, Nero's palace built after the fire of AD 64, extended over the Palatine, Esquiline and Caelian hills. After Nero's death, much of it was filled with soil, and the Baths of Trajan were built on top. The palace was rediscovered in the late fifteenth century, when a man fell through a gap into a decorated chamber. Renaissance artists, including Raphael, descended into the rooms to study their painted decoration, the "grotesques" that later shaped European ornament. Systematic excavation began in the eighteenth century, and the site opened to visitors only in 1999. In 2019, a previously unknown chamber was found during restoration work in the Colosseum Archaeological Park. Today, the Domus Aurea can be visited only on guided weekend tours because its fragile frescoes are sensitive to moisture and traffic vibration.

Excavation in the modern city is also constrained by everyday urban life. Construction of the Metro, particularly Line C, has repeatedly uncovered ancient remains that slow building work. Planners must then decide between preserving finds in place, sometimes by designing stations around them, and continuing projects that serve a growing population. Conservationists, city authorities and archaeologists continue to debate how to balance the study and protection of buried remains against traffic, housing and transport needs.

Vatican City and the Holy See

Vatican City exists because of the Lateran Treaty, signed on 11 February 1929 in the Lateran Palace by the Kingdom of Italy and the Holy See and ratified by the Italian parliament that June. It settled the Roman Question, the dispute that arose when the Italian state annexed the papal territories in 1870. Negotiations began in 1926 between Benito Mussolini and Cardinal Pietro Gasparri, who acted for Pope Pius XI. Under the treaty, the pope gained full sovereign jurisdiction over a very small territory, roughly 44 hectares, and Italy supplied services such as a railway station, a post office, a telegraph office and a radio station. The enclave is therefore an independent state lying entirely within the boundaries of Italy's capital.

The Lateran Treaty had three parts: a political treaty that recognised the sovereignty of the Holy See over the new state, a financial convention that compensated the papacy for its lost territories, and a concordat that regulated the position of the Catholic Church in Italy. The concordat made Catholicism the state religion, a provision that remained in force until 1984. The treaty was confirmed in the Italian constitution of 1948.

The terms "Holy See" and "Vatican" are often used interchangeably, but they refer to different things. Vatican City State dates only from 1929, whereas the Holy See, the episcopal see of Rome, is far older and is traditionally linked to the primacy of Saint Peter. The Holy See is the central government of the Catholic Church, led by the pope as bishop of Rome, and it maintains diplomatic relations with other states. Its territorial base is Vatican City, but diplomatic envoys are accredited to the Holy See rather than to the Vatican state. The treaty also pledged that the pope would stay neutral in international conflicts unless asked to mediate.

Church administration runs through the Roman Curia, a set of bureaus that assist the pope in governing the church. The Secretariat of State, headed by the Cardinal Secretary of State, directs and coordinates the Curia. Only the Secretariat is located inside Vatican City. The other Curial bodies occupy buildings elsewhere in Rome that enjoy extraterritorial rights, similar to those of embassies. Internal administration of Vatican City itself is handled separately, through the Pontifical Commission for the State of Vatican City. Pope Francis overhauled the Curia in 2022 through the apostolic constitution Praedicate evangelium, which reorganised its departments, known as dicasteries.

The Vatican's collections and visitor economy are a major part of the city's cultural life. The Vatican Museums house the papal collections, which have been assembled since the 15th century and which now comprise 24 museums together with galleries and chapels. The origins of the collection are often traced to 1503, when Pope Julius II donated his private holdings. The complex gives access to the Sistine Chapel, whose ceiling frescoes by Michelangelo (who was primarily a sculptor, though he also painted these frescoes) and the Raphael Rooms are among the most visited works of painting in the world. Annual visitors average about six million, although the pandemic reduced attendance sharply in 2020, and a statistics compilation reports a record of about 6.9 million in 2025. The museum's chief has warned that dust and pollutants carried in by large crowds could threaten the chapel's frescoes, which is why conservation and visitor management have become recurring policy issues.

The religious calendar also shapes the city. Ordinary Jubilee years, normally held every 25 years, are marked by the opening of the Holy Door at Saint Peter's Basilica, and they bring large flows of pilgrims that strain hotels, transport and public spaces. A statistics site reports that more than 33 million pilgrims visited during the 2025 Holy Year. Papal ceremonies in Saint Peter's Square and at the basilica, as well as the weekly audiences, bring further regular crowds. Together with the museums, these events make the Vatican one of the most intensively visited sites in UNESCO-listed Rome.

Arts, language and everyday culture

Language and dialect

Romanesco, the traditional speech of the city, is a Central Italian variety that stays linguistically close to Tuscan and Standard Italian, with some notable differences from these two. Written vernacular texts appear in the 13th century, when Latin and vernacular elements coexist in translations of historical and guidebook material. From the fifteenth century, Tuscan models reshaped the dialect considerably, so that it lost many of its Central Italian features, although the speech of the local Jewish community was less affected. Its most audible traits include the dropping of unstressed vowels at the start of words and the shortening of infinitives, so that parlare becomes parlà. Judeo-Roman, the language of the Jewish community confined to the Ghetto under papal authority, has at least 360 Hebrew words and phrases in it, and it declined after emancipation, when Roman Jews switched to the Roman dialect of Italian.

The dialect also has a literary life. Giuseppe Gioachino Belli's nineteenth-century sonnets made it a source of civic pride, and Trilussa wrote in it as well. In the twentieth century, Pier Paolo Pasolini's novels and a steady current of Roman cinema and television spread its vocabulary nationally, which is why expressions such as daje are recognised across Italy. Latin, by contrast, remains the working language of the Church's liturgy and of much scholarly and ecclesiastical life in Rome, especially within the Vatican.

Cinema, theatre, opera and music

Cinecittà, the film complex on the south-eastern edge of the city, was built during the Fascist period. The Cinecittà Studios were founded by Benito Mussolini in 1937 as a way to promote Rome and as a propaganda tool for the Fascist leader. The regime had pursued a broader effort to compete with Hollywood, and with an area of 400,000 square metres, it is the largest film studio in Europe. Sources differ on the number of Academy Awards won by films made there; one gives 51 that went on to win Academy Awards, while another gives 47.

After the war, the studio became central to the Italian film industry. Postwar Italian neorealism rejected many studio conventions, and it used amateur actors where possible and authentic locations for outdoor scenes. Rossellini's Rome, Open City, shot in the city's war-damaged streets, is the best-known example. In 1957 an American production, Ben-Hur, was shot at the studio; it would use more than 300 sets, 10,000 extras and more than 100,000 costumes. In the 1970s the complex declined, and it was later revived by productions such as Gangs of New York and La grande bellezza. It remains a working studio that hosts television series, and it also operates as a visitor attraction.

Rome's stage life is anchored by the Teatro dell'Opera, whose roots lie in the late nineteenth century, and by the Teatro Argentina, where Rossini's The Barber of Seville premiered in 1816. Puccini's Tosca, set in the city, was first performed at the Teatro Costanzi in 1900. The Auditorium Parco della Musica, designed by Renzo Piano and opened in 2002, hosts orchestral, jazz and popular concerts.

Cuisine and everyday customs

Roman cooking developed from inexpensive, filling food. Originally the ancient Roman specialties aimed to support farmers who worked in the fields all day, and many dishes rely on offal, pork products and pulses. The city's best-known repertoire is built around four pasta dishes. Cacio e pepe is one of the four traditional Roman pasta dishes that define the cuisine of Rome. Carbonara is made with guanciale, eggs and Pecorino Romano, and the authentic version contains no cream. Cacio e pepe relies on the emulsion of finely grated pecorino and starchy pasta water, with no butter, oil or cream. Alla gricia omits the tomato of amatriciana, which takes its name from the town of Amatrice.

The origin of carbonara is disputed. One account links it to charcoal workers, while another suggests it originated during the Second World War, when the Allied forces brought bacon and eggs to Italy. Other staples include supplì, a tomato rice croquette with a heart of mozzarella, and the thin, crisp pizza romana. Daily life centres on neighbourhood markets, bars and trattorie, where many Romans still shop and eat at lunchtime.

Festivals and religious observances

The religious calendar shapes public life. At Easter, the pope gives the Urbi et Orbi blessing from the loggia of St Peter's Basilica, and the liturgy in St Peter's Square draws large crowds. On Good Friday, the pope leads the Via Crucis at the Colosseum. The feast of Saints Peter and Paul on 29 June is a public holiday in the city, and Christmas is marked by nativity scenes in churches and by seasonal markets in the historic centre.

The Natale di Roma, celebrated on 21 April, commemorates the traditional founding of the city and is marked by civic events and historical displays. Ferragosto on 15 August, a national holiday, empties many neighbourhoods as residents leave the city for the coast or the hills.

Legacy in law, language and political thought

Roman law reached later societies mainly through the Corpus Juris Civilis, the compilation that the Byzantine emperor Justinian I commissioned in the sixth century. The development of Roman law covers more than one thousand years, from the Law of the Twelve Tables (from 449 BC) to the Corpus Juris Civilis of Emperor Justinian I (around 530). The text was little used in the Early Middle Ages. Its revival in the West began in the eleventh century, when Italian scholars at the University of Bologna revived the Corpus, and it became the foundation of medieval civil law. Later jurists did not simply repeat the text. The glossators and their successors reinterpreted it and added material from non-Roman sources. In Germany, Roman law served as "subsidiary law" until the nationwide code was established in 1900. Its influence also extended to the canon law of the Church and, through the Napoleonic Code, to Latin America. The impact on common law systems was much smaller, though the continued use of Latin legal terminology shows how deeply the tradition shaped legal vocabulary. The Corpus also still informs public international law.

The Latin language followed the same path of political expansion. Originally spoken by small groups of people living along the lower Tiber River, Latin spread with the increase of Roman political power, first throughout Italy and then throughout most of western and southern Europe. The Romance languages grew out of the spoken forms of this language in different parts of the empire, not out of the literary Latin taught in schools. During the Middle Ages and until comparatively recent times, Latin was the language most widely used in the West for scholarly and literary purposes. Its vocabulary remains embedded in modern tongues. Many words adapted from Latin are found in other modern languages, including English, where roughly six out of every ten commonly-used words are derived, directly or indirectly, from Latin. Latin itself was displaced as the lingua franca of Western learning only gradually; it was replaced in that capacity by French in the 18th century, although it continued in some intellectual and political circles.

The writing system that carried this language is one of Rome's most durable inheritances. The Latin alphabet is derived from the earlier Etruscan alphabet, and it reflects a mix of Phoenician, Greek and Etruscan forms. Apart from Latin itself, the alphabet was adapted to the direct descendants of Latin (the Romance languages), Germanic, Celtic and some Slavic languages from the Middle Ages, and finally to most languages of Europe. Its spread was driven partly by religion, as with the spread of Western Christianity the Latin alphabet spread to the peoples of northern Europe, and later by colonial expansion. Today it is the most widely used alphabet in the world, and it serves as the script of English and most major European languages.

Roman political thought developed in the Republic and was revived in early modern debate. The constitution of the Republic rested on a balance among several bodies. The constitution of the Roman republic was characterised by the separation of powers between the tribune of the plebs, the senate of the patricians, and the elected consuls. Two consuls served one-year terms, and each consul had veto power over the actions of the other consul. The Greek historian Polybius analysed this arrangement, and his account was admired by thinkers including Machiavelli, James Harrington, Algernon Sidney, Montesquieu, John Adams, and James Madison. The influence on the American framers is clear. The framers of the U.S. Constitution incorporated Roman ideas about the separation of powers and the need for a senate. Historians debate the route of this influence: some stress direct reading of Roman authors, while others point to Montesquieu's 1748 treatise, which was inspired by Cicero. The Founders were also aware of the Republic's collapse, and the Founders also knew that Rome degenerated into autocracy in the first century BC. The Republic's concept of citizenship, with its rights and duties attached to membership in the community, likewise became a reference point for later debates on democracy and the constitutional protection of individual rights.

Roman models also shaped architecture from the Renaissance onward. Architects of the fifteenth and sixteenth centuries studied surviving ruins and the classical treatise of Vitruvius, and used the orders and proportions they derived from them in churches, palazzi and villas. The Renaissance revival of these forms was later followed by the neoclassical movement of the eighteenth and nineteenth centuries, which drew on archaeology at Pompeii and Herculaneum and on the travel of educated Europeans to Italy. Its public buildings in Europe and North America often used Roman temples and domes as models. Thomas Jefferson's rotunda at the University of Virginia, for example, drew on the Pantheon, while the Virginia State Capitol was modelled on the Roman temple of the Maison Carrée at Nîmes in southern France. Neoclassicism also drew on Greek precedents, so Roman forms were one strand among several in these revivals.

Research, archaeology and conservation

Interest in Rome's ruins predates professional archaeology by centuries. Renaissance antiquarians gathered inscriptions, coins and statues, and in the eighteenth century the most widely circulated images of the ancient city came from engravers. Giovanni Battista Piranesi spent eight years researching the ancient ruins of Rome before completing his magnum opus, Le Antichità Romane. The 1756 edition quickly made him an authority on Roman archaeology and architecture, and it was a popular purchase among wealthy travelers, mainly British men, on their coming-of-age European Grand Tour. Some of his views blended observation with invention, since he presented imaginary views of ancient Rome and drew on earlier prints and written accounts of works that no longer survived. He also dealt in antiquities, and he collected ancient ornaments during quests in and around Rome and then 'restored' them by having them assembled.

After Rome became the capital of unified Italy in 1871, the study of the city's past acquired a political dimension. Before that, the forum had been only partly visible, since the remains of some isolated ancient structures were visible above ground, but the appearance of the forum as a whole remained a mystery. The new state treated the ancient centre as a national showcase, and public money flowed into digging, restoration and study.

The most consequential figure in this period was Giacomo Boni, a Venetian architect who is best known for his excavations at Rome, especially those in and around the Forum Romanum undertaken from 1898 onward. The forum as we see it today is largely a product of Boni's excavations, carried out between 1898 and 1925. His significance lies in method as much as in discovery. The method was applied for the first time in the excavations of the Roman Forum and consisted in stratigraphic surveys aimed at recognizing the stratifications and in removing the individual layers according to their natural deposit. Boni's teams also produced plans and sections of the tombs in the protohistoric necropolis, and he documented the site with advanced techniques like balloon photography and stratigraphy. The Museum of the Roman Forum, founded in the early twentieth century in a former convent, now arranges its displays to narrate the stratigraphic sequence of the Forum and demonstrate its long transformation.

Modern practice builds on this foundation with a range of tools. Stratigraphic recording remains the basic discipline of urban excavation, where later layers must be read against earlier ones and every removed deposit must be documented. Remote sensing and non-invasive geophysical survey now allow archaeologists to locate buried streets, walls and foundations before any digging begins, which reduces the damage that excavation causes in a dense modern city. Digital documentation has also expanded. A 2010 project by the DHARMA Lab, working with the archaeological park of the Colosseum, set out to measure, document, and draw large areas of the historic site. Its approach combines the advantages of the latest technology with hand tools.

The protection of the historic centre rests on international recognition and national heritage law. The city's core was first inscribed on the World Heritage List in 1980 and extended in 1990 to the walls of Urban VIII, to the Holy See's extraterritorial properties, and to the Basilica of Saint Paul's Outside the Walls. Several listed sites are legally under the authority of the Vatican while physically situated within Rome, which means that conservation there involves two sets of institutions. Management of the ancient zones, including the Forum and the Palatine, is handled by specialised archaeological authorities, and every intervention has to weigh the preservation of buried layers against the needs of a city that continues to function on top of them.

Several research questions remain open. Estimates of the imperial city's population rest on indirect evidence, such as housing capacity and grain distribution, and they differ considerably among scholars. The early Republic is poorly documented, so its chronology is reconstructed from later literary sources and from excavated layers that are often fragmentary. The reconstruction of Rome's water supply and sewage systems is also ongoing, and new excavation and survey regularly revise earlier models of how the city's infrastructure worked.

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