Muhammad ibn Abi Bakr
Ali continued to be regarded as Caliph by his followers in the last year of his life, however the number of his partisan were reducing. At about the same time, unrest was brewing in Egypt. The governor of Egypt, Qais, was recalled, and Ali had him replaced with Muhammad ibn Abi Bakr (the brother of Aisha and the son of Islam's first caliph Abu Bakr). Muawiyah allowed 'Amr ibn al-'As to move against Egypt and 'Amr eventually conquered it for the second time in his career. Amr had first taken Egypt eighteen years earlier from the Romans but had been dismissed by Uthman. Muhammad ibn Abi Bakr had no popular support in Egypt and managed to muster 2000 men but they dispersed without a fight. Muawiyah's army occupied many cities of Iraq, which Ali's governors could not prevent, and the people offered no support for a defense. So Muawiyah overpowered Egypt, Hijaz, Yemen and other areas. In the same time, revolts took place in Khorasan and the East Arab rules were overthrown, but the riot in Fars was put down by Caliph's governor.