al-Mansur bi-Nasr Allah, caliph of the Fatimid Caliphate (born 913)

Al-Mansur Billah

Fatimid ruler (r. 946–953) and 13th Ismaili Imam

Abu Tahir Isma'il, better known by his regnal name al-Mansur Billah, was the thirteenth Isma'ili imam and third caliph of the Fatimid Caliphate in Ifriqiya, ruling from 946 until his death. He succeeded his father, al-Qa'im, after the latter's death, in what was likely a…