Dates: r.
3rd Fatimid Caliph in Ifriqiyya
Abu Tahir Isma'il, better known by his regnal name al-Mansur bi-Nasr Allah, was the third caliph of the Fatimid Caliphate in Ifriqiya, ruling from 946 until his death. He presided over a period of crisis, having to confront the large-scale Kharijite rebellion of Abu Yazid. He succeeded in suppressing the revolt and restoring the stability of the Fatimid regime.
