Abbasid Caliphate Begins

Setting the scene

By 750 CE, the Umayyad Caliphate faced widespread discontent—non-Arab Muslims (mawali) resented second-class status, Shi'a opposed Umayyad rule, and Persians chafed under Arab dominance. The Abbasids, descendants of Muhammad's uncle Abbas, claimed legitimacy and built a coalition of these groups. They used black banners as their symbol and propaganda claiming they would restore true Islam. In 747, Abu Muslim launched a revolt in Khurasan (eastern Iran), gaining support from Persians and others.

What happened

In 750, Abbasid forces defeated the Umayyads at the Battle of the Zab River in Iraq. The last Umayyad caliph, Marwan II, fled to Egypt where he was killed. The Abbasids invited 80 Umayyad princes to a 'reconciliation' banquet, then massacred them. One prince, Abd al-Rahman, escaped to Spain and founded the Umayyad Emirate of Córdoba in 756. The Abbasids moved the capital from Damascus to Baghdad, founded in 762 near the old Persian capital Ctesiphon, symbolizing their Persian orientation.

Why it still matters

The Abbasid Caliphate (750-1258) ushered in the Islamic Golden Age, with Baghdad becoming the world's leading center of learning, science, and culture. The Abbasids embraced Persian administrative traditions and promoted equality for non-Arab Muslims, leading to Islam's rapid expansion. They sponsored the translation movement that preserved Greek philosophy and advanced mathematics, astronomy, and medicine. The Abbasid period saw the flourishing of figures like Al-Khwarizmi (algebra) and Avicenna. Though the caliphate fragmented after 850, the Abbasids remained symbolic leaders until the Mongols sacked Baghdad in 1258. The Abbasid revolution demonstrated how claims of religious legitimacy could overthrow an empire.

Background

Baghdad became a major center of learning and trade. Even centuries later, this episode remains a reference point for how empires rise, fracture, and transform.