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Abd Allah al-Mahdi Billah

Isma'ili Imam and first Fatimid Caliph from 909 to 934DynastyFatimidFatheral-Husayn ibn Ahmad (Abdallah al-Radi)ReligionIsma'iliShi'a IslamAbū Muḥammad ʿAbd Allāh ibn al-Ḥusayn (Arabic: أبو محمد عبد الله بن الحسين; 31 July 874 – 4 March 934), better known by his regnal nameal-Mahdī biʾllāh (Arabic: المهدي بالله, "The Rightly Guided by God"), was the founder of the Isma'iliFatimid Caliphate, the only major Shi'acaliphate in Islamic history, and the eleventh Imam of the Isma'ili branch of Shi'ism.

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