[Then the year 151 AH began]
In that year al-Manṣūr removed ʿUmar ibn Ḥafs from the governorship of Sind and appointed in his place Hishām ibn ʿAmr al-Taghlibī. The reason for his dismissal was that, when Muḥammad ibn ʿAbd Allāh ibn al-Ḥasan rose in rebellion, he sent his son ʿAbd Allāh—nicknamed al-Ashtar—together with a group bearing a gift and fine, thoroughbred horses to this very ʿUmar ibn Ḥafs in Sind, and the latter accepted them. They then invited him, in secret, to support the cause of Muḥammad ibn ʿAbd Allāh ibn al-Ḥasan; he agreed, and secretly secured for him the oath of allegiance from every commander he could. Those commanders complied and put on white garments.
When news arrived of Muḥammad ibn ʿAbd Allāh’s death in Madinah, ʿUmar ibn Ḥafs and his associates were struck with dismay and began to offer excuses to ʿAbd Allāh ibn Muḥammad. ʿAbd Allāh said to him, “I fear for my life.” ʿUmar replied, “I will send you to a king among the polytheists neighboring our land. He is among the people who most revere the Messenger of Allah, peace and blessings be upon him, and once he learns that you are of his lineage he will love you.” ʿAbd Allāh agreed, and set out to that king, where he lived in safety. He would ride forth in a Zaydī cortege, hunt accompanied by a great host of troops, and many people rallied to him; contingents of the Zaydīs continued to arrive and join him.
As for al-Manṣūr, he sent word reproaching ʿUmar ibn Ḥafs, the governor of Sind. One of the commanders said, “Send me to him and entrust the matter to me; I shall present an apology on your behalf. If I return safely, so much the better, and if not, let my life be a ransom for you and for the commanders with you.” So al-Manṣūr dispatched him as an envoy. When he stood before the caliph, al-Manṣūr ordered that he be beheaded. He then wrote to Ibn Ḥafs removing him from Sind and appointing him over the territories of Ifrīqiyah in place of its governor.
When al-Manṣūr sent Hishām ibn ʿAmr to Sind he instructed him to spare no effort in capturing ʿAbd Allāh ibn Muḥammad. Hishām, however, tarried, so al-Manṣūr wrote urging him on. Matters then transpired such that Saif, the brother of Hishām ibn ʿAmr, encountered ʿAbd Allāh ibn Muḥammad in a certain place; they fought, and ʿAbd Allāh and all his companions were slain. His body was lost among the dead, so they could not seize it. Hishām ibn ʿAmr wrote to al-Manṣūr informing him of the killing, whereupon the caliph thanked him and ordered him to fight the king who had sheltered ʿAbd Allāh. He also told him that ʿAbd Allāh had taken a concubine there who had borne him a son named Muḥammad; therefore, when you capture that king,