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This study deals with the religious aspects that the Caliphs of Bani Abbas worked to highlight to the public in an attempt to gain support to stand in the face of the opposition movements, especially the Alawites on the one hand, and in order to gain religious legitimacy for their caliphate in the hearts of the subjects on the other hand. The research dealt with the most prominent policies and methods they followed to achieve their political goals which they molded within a religious character.
Fathi Shawawreh (Mon,) studied this question.