Abd Allah al-Mahdi Billah
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Abū Muḥammad ʿAbd Allāh ibn al-Ḥusayn, better known by his regnal name al-Mahdī biʾllāh, was the founder of the Isma'ili Fatimid Caliphate, the only major Shi'a caliphate in Islamic history, and the eleventh Imam of the Isma'ili branch of Shi'ism.
Remains of the northern gate of Sijilmasa
The Skifa Kahla, the landward gate of Mahdiya
Bulgarian emperor Simeon (left) sending envoys to Caliph al-Mahdi (right). 12th-century miniature from the Madrid Skylitzes
Mahdi
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The Mahdi is a prominent figure in Islamic eschatology who is believed to appear at the End of Time to rid the world of evil and injustice. He is said to be a descendant of Muhammad, who will appear shortly before Jesus and will lead the Muslim Ummah to rule the entire world.
The Al-Askari Shrine in Samarra, Iraq, stands where the house of the 11th Twelver imam Hasan al-Askari and the Mahdi once used to be.
Jamkaran Mosque in Qom, Iran, where Hassan ibn Muthlih Jamkarani is reported to have met the Twelver Mahdi
The Egyptian capital city of Cairo in 2014, where Abu'l-Qasim al-Tayyib, son of Fatimid Caliph Al-Amir bi-Ahkam Allah, was born. Pictured are the Sultan Hasan and Al-Rifa'i Mosques.
Gold dinar of the first Fatimid caliph, Abd Allah al-Mahdi Billah, 910/911