Al-Mustain of Cairo

Al-Mustain became caliph after the death of Al-Mutawakkil I. His reign was initially ceremonial, but he later became involved in Mamluk politics.

During a succession crisis, Al-Mustain was proclaimed Mamluk Sultan by the emirs after the death of Sultan Faraj. He ruled for only a few months before being deposed by Emir Al-Mu'ayyad Shaykh. This was the only time a Cairene Abbasid caliph held temporal power.

After being deposed as sultan, Al-Mustain was forced to abdicate the caliphate and was exiled to Alexandria. He died there in 1430, ending his unique dual role.