How did Ismaili Shiism shape Fatimid claims to the caliphate?

Ismaili Shiism was fundamental to the Fatimid dynasty’s legitimacy, providing both the theological framework for their authority and the organizational structure for their expansion.

The Fatimids claimed the caliphate through their descent from the Prophet Muhammad via his daughter Fatimah and his kinsman Ali. As Ismaili imams, they were viewed by their followers as the divinely chosen, infallible guides for humankind and the only rightful heads of the universal Islamic community.12

This doctrine allowed the Fatimids to reject the Abbasid caliphs as usurpers. To challenge the Sunni order, the Fatimids institutionalized their faith as a state religion, utilizing a sophisticated network of missionaries to disseminate Ismaili theology and subvert Abbasid authority. By merging their imperial ambitions with the universal goals of the Ismaili faith, the Fatimids sought to replace the existing religious and political order with their own caliphate, establishing centers of learning like Al-Azhar to train missionaries and solidify their ideological claims.12