Alexander the Great (356–323 BCE) was king of Macedon from 336 BCE until his death. He conquered the Achaemenid Persian Empire and established an extensive, though short-lived, empire reaching from the Greek world and Egypt to Central Asia and the northwestern Indian subcontinent. His campaigns transformed relations between Greek civilization and the societies of western and southern Asia. His death conventionally marks the beginning of the Hellenistic period, when successor kingdoms developed distinctive combinations of Greek and local institutions and cultures. (iranicaonline.org)
Early life and accession
Alexander was born at Pella, the Macedonian royal capital, in 356 BCE. His father, Philip II, expanded Macedonian power and reorganized its army; his mother, Olympias, belonged to the royal family of Epirus. During his adolescence Alexander studied with Aristotle, receiving an education rooted in Greek intellectual traditions. His preparation for kingship also included practical military and administrative experience. (media.australian.museum)
Following Philip’s assassination in 336 BCE, Alexander became king at approximately twenty. He inherited both a powerful army and Philip’s project for an invasion of Persian territory. Before undertaking that expedition, he secured Macedonia’s northern frontier and suppressed resistance in Greece. In 335 BCE his forces captured and destroyed Thebes after its revolt, demonstrating that the Greek cities remained subject to Macedonian military supremacy. (archive.ph)
Conquest of the Persian Empire
Alexander crossed into Anatolia in 334 BCE. Victory at the Granicus River opened the way to further operations in western Asia Minor. In 333 BCE he defeated the Persian king Darius III at the Battle of Issus. Rather than immediately pursuing Darius inland, he advanced along the eastern Mediterranean coast, capturing Persian-controlled ports and reducing the threat posed by Persian naval power. The sieges of Tyre and Gaza in 332 BCE involved destructive assaults and enslavement of captives. (iranicaonline.org)
Alexander entered Egypt in 332 BCE and founded Alexandria the following year. He also visited the oracle of Ammon at Siwa, an episode that became important to traditions concerning his divine ancestry. Egypt subsequently became a major center of the Hellenistic world, although Alexandria’s principal scholarly and cultural institutions developed under his successors. (archive.ph)
On October 1, 331 BCE, Alexander decisively defeated Darius at the Battle of Gaugamela. He then occupied Babylon, Susa, and Persepolis, gaining access to Persian administrative centers and royal treasuries. Persepolis was looted, and its palace complex was burned. Darius’s murder by members of his own entourage in 330 BCE removed Alexander’s principal royal opponent, but organized resistance continued in the eastern provinces. (iranicaonline.org)
Central Asia and the Indian campaign
Campaigns in Bactria and Sogdiana required prolonged operations against regional rulers and mobile resistance. Alexander established garrisons and settlements while negotiating alliances with local elites. In 327 BCE he married Roxana, the daughter of the regional nobleman Oxyartes, strengthening ties with an influential family. These territories were not secured simply by the earlier defeat of the Persian king. (archive.ph)
Alexander subsequently advanced into the northwestern Indian subcontinent. In 326 BCE he defeated Porus at the Battle of the Hydaspes, fought near the modern Jhelum River. Porus remained a ruler under Alexander’s authority. Farther east, at the Hyphasis, now the Beas River, Alexander’s troops refused to continue. He abandoned further eastward expansion and returned through the Indus valley. Part of his army then crossed Gedrosia, where severe environmental conditions caused substantial losses. (archive.ph)
Warfare and imperial government
Alexander’s forces combined the Macedonian phalanx, armed with long pikes, with cavalry, lighter infantry, and siege equipment. His battlefield methods depended on coordination between these arms rather than on a single formation. Cavalry attacks frequently supplied the decisive maneuver, while infantry maintained pressure and protected the army’s cohesion. His campaigns also demanded adaptations to fortified cities, mountainous terrain, and unfamiliar enemy forces. (en.wikisource.org)
Government depended partly on existing Persian structures, including provincial governorships known as satrapies. Alexander employed both Macedonian and Asian personnel, while increasingly adopting elements of Persian royal presentation. In 324 BCE he organized marriages at Susa between members of his entourage and Iranian noblewomen and expanded the recruitment of Asian soldiers. These measures generated tensions among Macedonians who feared changes to their position within the army and court. (iranicaonline.org)
Death and succession
Alexander died at Babylon in June 323 BCE, aged thirty-two, after an illness. The surviving accounts do not establish its cause with certainty. He left no adult heir capable of exercising effective authority over the empire. His half-brother Philip III Arrhidaeus and his posthumous son Alexander IV were recognized as kings, but practical power rested with commanders and regents. (archive.ph)
The ensuing struggles among the Diadochi, or “Successors,” fragmented the empire. Major dynasties eventually included the Ptolemies in Egypt, the Seleucids across much of western Asia, and the Antigonids in Macedonia. Their kingdoms supported new cities, artistic patronage, and exchanges between Greek-speaking populations and established regional societies. This cultural interaction did not eliminate local traditions; Hellenistic art and institutions reflected diverse regional influences. (metmuseum.org)
Historical sources and later traditions
The principal surviving literary narratives were written long after Alexander’s lifetime. Arrian drew extensively on accounts attributed to participants, particularly Ptolemy and Aristobulus, but those works no longer survive independently. Their differing interests and perspectives complicate reconstruction of Alexander’s intentions and personality. (livius.org)
A separate tradition, the Alexander Romance, transformed his career into a fictionalized account incorporating marvels and invented adventures. Its versions circulated across numerous languages and literary cultures. These texts document Alexander’s changing cultural reception rather than provide straightforward evidence for the events of his reign. (academic.oup.com)