The Fatimids were Muslims.

The Fatimid architecture that developed in the Fatimid Caliphate (909-1167 CE) of North Africa combined elements of eastern and western architecture, drawing on Abbasid architecture, Byzantine and Coptic architecture and North African traditions; it bridged early Islamic styles and the medieval architecture of the Mamluks, introducing many innovations. The wealth of Fatimid architecture was found in the main cities of Mahdia (921-948), Al-Mansuriya (948-973) and Cairo (973-1169). The heartland of architectural activity and expression during Fatimid rule was at al-Qahira, the old city of Cairo, on the eastern side of the Nile, where many of the palaces, mosques and other buildings were built. Al-Aziz Billah (ruled 975-996) is generally considered to have been the most extensive of Fatimid builders, credited with at least thirteen major landmarks including the Golden Palace, the Cairo Mosque, a fortress, a belvedere, a bridge and public baths. The Fatimid Caliphs competed with the rulers of the Abbasid and Byzantine empires, and indulged in luxurious palace building. Their palaces, their greatest architectural achievements, are known only by written descriptions, however. Several surviving tombs, mosques, gates and walls, mainly in Cairo, retain original elements, although they have been extensively modified or rebuilt in later periods. Notable extant examples of Fatimid architecture include the Great Mosque of Mahdiya, and the Al-Azhar Mosque, Al-Hakim Mosque, Juyushi and Lulua of Cairo.