Aspects of this topic are discussed in the following places at Britannica.
...that succession to ʿAlī’s position of imam, or leader, of the Muslim community had devolved on Muḥammad ibn al-Ḥanafīyah (d. c. 700), one of his sons, and Abū Hāshim, a grandson. The Hāshimīyah thus did not recognize, for religious reasons, the legitimacy of Umayyad rule, and when Abū Hāshim died in 716, without...
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