The Origins of the Crisis in Amin-Ma mun's Relations

After the Harun's death, the Abbasid Caliphate plunged into political crisis. The caliphate's territory was divided into eastern and western halves. The early Islamic historians generally say that the internal crisis of the Abbasid caliphate was started when the caliph Amin ignored Mamun's right of sovereignty over the eastern half of the empire and contravened the Meccan protocol which had segregated Mamun's authorized limits and Amin's realm. Therefore, Mamun's army captured Baghdad and took possession of power by killing the caliph Amin. This study tries to found its achievements -with a different approach- on the following hypotheses: Firstly, Harun did not divide his territory in the Meccan protocol and did not distinguish the authority sphere of his sons. Secondly, the claim of Khurasan's autonomy has been added to the Meccan protocol after the murder of the caliph Amin for justifying Mamun's autonomy in Khurasan and condemning Amin as the violator of the Meccan protocol and the real agent of the civil war. Thirdly, Ma’mun’s disobedience towards the Caliph Amin’s orders, paved the way for internal crisis.