11th-century Fatimid caliphs

6th Fatimid caliph (r. 996–1021) and 16th Ismaili Imam

Abū al-Qāsim Aḥmad ibn al-Mustanṣir (; 15/16 September 1074 – 11/12 December 1101), better known by his regnal name al-Mustaʿlī biʾllāh (, ), was the ninth Fatimid caliph and the 19th imam of Musta'li Ismailism.

Egyptian caliph from 1036 to 1094/95

Fatimid dynasty caliph from 1021 to 1036