Ismaili.NET - Heritage F.I.E.L.D.

Abbas, the uncle of the Prophet had a son, Abdullah, who never tried to establish his own caliphate. Abdullah and his son, Ali bin Abdullah resided in Humayma. It was the latter's son, Muhammad bin Ali to have taken the charge of Kaysaniya sect from the dying Abu Hashim. Thus, the house of Abbas inherited the party and organization of Abu Hashim along with his claims. Muhammad bin Ali led the Kaysaniya sect, and propagated in the name of Ahl al-Bayt, declaring that the caliph should be from Alid descent and the Umayyads had no right to rule.