Abbas, the uncle of Holy 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 organisation of Abu Hashim along with his claims. Muhammad bin Ali led the Kaysaniya sect, and propagated in the name of Ahl-al-Bait, declaring that the caliph should be from Alid descent and the Umayyads had no right to rule. It was mere an ostensible slogan to procure wide supports of the Alids and nourish future political ambition. Muhammad bin Ali died before attaining his objective and handed on his claims to his son, Ibrahim. He began to dispatch emissaries, starting with Khorasan, where the bulk of the Kaysaniya faction resided.
In the meantime, the newly acclaimed Umayyad calipha Marwan sought to strike at the centre of the whole movement by arresting Ibrahim. He is said to have strangled him as Yaqubi writes, by having his head put into a bag of lime until he died. But Ibrahim had two brothers, Abul Abbas and Abu Jafar Mansur, both of whom escaped to Khorasan. And very soon these two brothers returned, supported by Abu Muslim's victorious troops, to lead the insurgents in their final struggle in the West. Their way had been prepared for them in Kufa by propaganda that had been carried on for more than twelve years.