Al-Mu'tasim

Abū Isḥāq Muḥammad ibn Hārūn al-Rashīd, known as al-Mu'tasim biʾllāh, was born in October of the year seven hundred ninety-six and became the eighth Abbasid caliph, ruling from eight hundred thirty-three until his death in eight hundred forty-two. Following the unexpected death of his half-brother al-Ma'mun during a campaign, al-Mu'tasim ascended to the caliphate with the backing of influential figures, notably the chief qādī Ahmad ibn Abi Duwad. His reign was characterized by the continuation of the rationalist Islamic doctrine of Mu'tazilism and the implementation of the miḥna policy.

As a younger son of the renowned Caliph Harun al-Rashid, al-Mu'tasim distinguished himself by forming a private army primarily composed of Turkic slave-soldiers, known as ghilmān. This military force proved invaluable to his half-brother and later to al-Mu'tasim himself, as it helped counterbalance various powerful factions within the state and was instrumental in campaigns against both internal rebels and the Byzantine Empire.

Although al-Mu'tasim was not particularly inclined towards literary pursuits, he played a significant role in nurturing the scientific renaissance initiated under al-Ma'mun. His reign marked a pivotal shift in Islamic history, establishing a military-centric regime with a new capital at Samarra in eight hundred thirty-six, which aimed to distance the caliphate from the politically volatile Baghdad.

Al-Mu'tasim's government centralized power, diminishing the influence of provincial governors in favor of a select group of senior officials in Samarra. This shift increasingly marginalized the Arab and Iranian elites who had been vital to the early Abbasid state, thereby strengthening the position of the Turks and their leaders. His reign was also marked by continuous warfare, including significant campaigns against the Khurramite uprising and a notable external campaign against the Byzantine Empire, culminating in the celebrated sacking of Amorium in eight hundred thirty-eight.