At-Tayyib Abi l-Qasim

Al-Ṭayyib Abū'l-Qāsim ibn Al-Manṣūr was, according to the Tayyibi Isma'ili-Musta'li sect of Isma'ilism, the twenty-first Imam and the last Caliph of the Fatimid Caliphate. Abu Al-Qasim was the son of the twentieth Fatimid Imam, Al-Amir bi-Ahkami'l-Lah, who ruled Egypt from 1101 to 1130. He was born in Cairo on Sunday, March 16, 1130 and was 2 years 7 months old when his father, Al-Amir, was assassinated in the night of Thursday, October 15, 1132. Tayyib was reported to be about two years old at the time of al-Amir's assassination. Al-Hafiz was appointed representative Caliph on behalf of Imam Al-Tayyib. Later Al-Hafiz declared himself as Imam and Caliph in 528 AH/1134 AD, and Al-Tayyib was believed by Taiyabis to be taken into hiding.