The Abbasid Caliphate was a dynastic caliphate that succeeded the Umayyad Caliphate in 750 and ruled from Iraq until 1258. Its rulers claimed descent from al-Abbas, an uncle of the prophet Muhammad. Centered principally on Baghdad, it governed extensive territories while claiming leadership of the Muslim community. Its history encompasses both an early imperial state and later periods when regional dynasties exercised effective power. After the Mongol conquest of Baghdad, an Abbasid caliphal line was established in Cairo, where it survived under Mamluk patronage until 1517. (en.wikisource.org)
Revolution and consolidation
The Abbasids came to power through a movement rooted in Khorasan, a northeastern region of the Islamic empire. Their supporters included Arab settlers and non-Arab Muslims dissatisfied with Umayyad government. Abu Muslim organized the uprising that began in 747. Rather than a straightforward struggle between Arabs and Persians, the revolution involved a mixed regional coalition united by allegiance to Islam and the Abbasid cause. (iranicaonline.org)
In 750, Abbasid forces defeated the army of Marwan II at the Greater Zab River, ending Umayyad rule in the central Islamic lands. The first Abbasid caliph, al-Saffah, was followed by al-Mansur, who reigned from 754 to 775. Al-Mansur consolidated the dynasty, eliminated powerful rivals, including Abu Muslim, and founded Baghdad in 762. An Umayyad survivor, Abd al-Rahman I, established an independent emirate in Córdoba in 756, leaving the Iberian Peninsula outside Abbasid control. (worldhistory.org)
Government and imperial society
The relocation of the political center from Syria to Iraq brought the caliphate into closer contact with Iranian administrative traditions and the resources of Mesopotamia. Government departments, or diwans, handled finance, correspondence, and provincial affairs. The vizier emerged as a major executive official, while the postal and intelligence network helped connect the court with provincial governors. Persian secretaries and influential families, notably the Barmakids, occupied important administrative positions. Arabic nevertheless remained the principal language of government and scholarship. (iranicaonline.org)
Caliphal authority depended on officials, provincial revenues, and military forces. The early regime relied heavily on troops from Khorasan. During the ninth century, al-Mu'tasim expanded the recruitment of Turkic soldiers, including enslaved military recruits. He established Samarra as a new court and garrison center; it served as the capital from 836 to 892. Military commanders subsequently acquired substantial influence over succession and court politics. (encyclopedia.com)
Economy and urban life
Agricultural production and commerce supplied the wealth of the early caliphate. Baghdad's position near the Tigris and the cultivated lands of central and southern Iraq connected the capital with food supplies and commercial routes. Growing towns supported markets, crafts, and specialized occupations. Paper, cotton, and sugar were among the products associated with expanding urban commerce. Civil war and political instability, however, damaged the Iraqi agricultural economy, which was declining by the early tenth century. (encyclopedia.com)
Financial administration adapted to extensive commercial exchange and the circulation of different currencies. Specialist bankers known as jahabidha exchanged and administered funds for officials and the treasury. By the tenth century, instruments called suftajas facilitated payments and transfers without requiring all transactions to be settled through the physical movement of coins. Such arrangements served both private merchants and the remittance of provincial taxes. (iranicaonline.org)
Scholarship, religion, and artistic production
Baghdad became a major center of intellectual activity supported by the court and urban patrons. From the later eighth century, an extensive translation movement rendered Greek scientific and philosophical writings into Arabic. Intellectual production also included Arabic grammar, theology, literature, and poetry. Prominent figures included the grammarian Sibawayh, the poet Abu Nuwas, and the essayist al-Jahiz. These activities were not confined to the caliphal household but formed part of a wider urban scholarly culture. (encyclopedia.com)
Religious scholars developed Qur'anic interpretation, hadith studies, and Islamic law. The Hanafi, Maliki, Shafi'i, and Hanbali legal schools emerged as major traditions within Sunni Islam. Scholars served as judges and other officials while maintaining sources of authority distinct from the caliphate. (encyclopedia.com)
Abbasid artistic production influenced regions beyond direct caliphal control. Samarra preserves important evidence of Islamic architecture, including monumental mosques and palaces. Its carved stucco decoration employed beveled surfaces and repeated abstract vegetal forms. Lustre-painted ceramics, valued for their metallic appearance, spread from Iraq to other production centers, including Egypt, Iran, and Spain. (metmuseum.org)
Fragmentation, revival, and the Cairo caliphs
The succession struggle between al-Amin and al-Ma'mun after Harun al-Rashid's death in 809 weakened imperial cohesion. During the ninth and tenth centuries, provincial families established increasingly autonomous governments. Some continued to acknowledge Abbasid authority through tribute, coinage, or the Friday sermon even while exercising substantial independence. The rival Fatimid Caliphate, established in 909, also challenged Abbasid claims to leadership. (encyclopedia.com)
The Buyids occupied Baghdad in 945, and the Seljuks displaced them in 1055. Under these rulers, the caliphs generally retained religious and ceremonial standing without controlling the principal military resources. Abbasid political power revived as Seljuk authority weakened during the twelfth century, particularly under al-Nasir, who reigned from 1180 to 1225. (metmuseum.org)
In 1258, forces of the Mongol Empire under Hülegü captured Baghdad and killed Caliph al-Musta'sim. In 1261, the Mamluk Sultanate sponsored the restoration of an Abbasid caliphate in Cairo. These caliphs did not recreate the Iraqi empire, but participated in ceremonies of investiture and helped legitimate sultanic rule. The Cairo institution ended with the Ottoman conquest of Egypt in 1517. (worldhistory.org)