Al-Musta'li
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Abū al-Qāsim Aḥmad ibn al-Mustanṣir, better known by his regnal name al-Mustaʿlī biʾllāh, was the ninth Fatimid caliph and the nineteenth imam of Musta'li Ismailism.
Gold dinar minted in Fustat in the name of al-Musta'li, 1099/1100
The capture of Jerusalem by the Crusaders, 14th-century miniature
A turban or shawl end produced during al-Musta'li's reign, with a tiraz proclaiming "proximate victory to the servant of Allah and his close friend Ma'add Abu Tamim, the imam Ahmad al-Qasim al-Musta'li bi-Allah and his sons"
Musta'li Ismailism
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The Musta‘lī are a branch of Isma'ilism named for their acceptance of al-Musta'li as the legitimate nineteenth Fatimid caliph and legitimate successor to his father, al-Mustansir Billah. In contrast, the Nizari—the other living branch of Ismailism, presently led by Aga Khan IV—believe the nineteenth caliph was al-Musta'li's elder brother, Nizar. Isma'ilism is a branch of Shia Islam.
Photo of the qibla of al-Mustansir Billah in the Mosque of Ibn Tulun in Cairo showing the Shahada
Photo of the Shahada at Bab al-Futuh Fatimid Cairo