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Caliphate and the dynastic monarchy of Banu Abbās

The rule of and "caliphate" of Banu Umayya came to an end at the hands of Banu Abbās a branch of Banu Hāshim, the tribe of Muhammad, only to usher another dynastic monarchy styled as caliphate from 750 CE. This period is seen formative in Sunni Islam as the founders of the four schools viz, Abu Hanifa, Malik ibn Anas, Shāfi'i and Ahmad bin Hanbal all practised during this time, so also did Jafar al Sādiq who elaborated the doctrine of imāmate, the basis for the Shi'a religious thought. There was no clearly accepted formula for determining succession in the Abbasid caliphate. Two or three sons or other relatives of the dying caliph emerged as candidates to the throne, each supported by his own party of supporters. A trial of strength ensued and the most powerful party won and expected favours of the caliph they supported once he ascended the throne. The caliphate of this dynasty ended with the death of the Caliph al-Ma'mun in 833 CE, when the period of Turkish domination began.