Abbasid Caliphate

The Abbasid Caliphate (Arabic: الدولة العباسية) was an Islamic caliphate established in the eighth century CE, after the Abbasids seized power from the Umayyads. Its name derives from Abbas ibn Abd al-Muttalib, uncle of the Prophet Muhammad, which served as a legitimating claim to descent from Hashim.

The seat of government initially relocated to Iraq, specifically Baghdad, which was founded in the eighth century. This relocation shifted the political centre of gravity: administrative sophistication and culture became rooted in Iraq and Iran, whereas they had previously been anchored in the Levant. The actual locus of power shifted repeatedly over time, until the caliph became a symbolic figurehead without substantial military authority.

Foundations and Movement

The Abbasid movement began in Khurasan, drawing together diverse groups: Arabs opposed to Umayyad rule and Persian speakers seeking a share in administration. This coalition of different interests later produced internal conflict, particularly among some Shi'a who believed power should pass to the descendants of Ali ibn Abi Talib. When the Abbasids took power, they established a formal state with ministries, government departments (diwans), and a chief minister (vizier).

Administrative System

Abbasid administration relied on a written system: land taxation, accounting, and the postal service (bariid), which also carried political intelligence. The vizier's office became the centre of financial decision-making, while the caliph retained supreme authority. Later, the military—usually recruited from Turkish-speaking populations—became a powerful faction capable of making or removing caliphs.

Learning and Translation

During the Abbasid period, an extensive translation effort took place: Greek, Syriac, Persian, and Indian texts were rendered into Arabic, particularly in mathematics, astronomy, medicine, and philosophy. Scholars from diverse regions made Baghdad and other cities centres of intellectual work that established foundations for algebra and astronomical instruments. Islamic scholarship was also systematized there: jurisprudence, hadith studies, and theology.

Fragmentation and End

From the ninth and tenth centuries onward, many provinces became autonomous, though their rulers still invoked the caliph's name in Friday sermons. Various dynasties—such as the Buyids and later the Seljuks—held actual power in Baghdad. Abbasid rule in Baghdad ended when the Mongols conquered the city in the thirteenth century; an Abbasid successor lineage subsequently held a nominal caliphate in Egypt under Mamluk suzerainty.