Abd Allah al-Mahdi Billah

Abd Allah al-Mahdi Billah was the first Fatimid caliph and founder of the Fatimid dynasty, ruling from 909 to 934.

Ismailism: A branch of Shia Islam that recognizes a line of imams descended from Isma'il ibn Ja'far. Al-Mahdi claimed the Ismaili imamate, grounding his authority in a religious lineage.
Fatimid Caliphate: A Shi'a caliphate that ruled parts of North Africa and the Middle East from 909 to 1171. Al-Mahdi founded the state whose institutions and territorial reach later expanded.
Al-Qa'im bi-Amr Allah: The second Fatimid caliph, who ruled from 934 to 946 as al-Mahdi's successor. His succession tested the continuity of the dynasty al-Mahdi founded.
Fatimid conquest of Ifriqiya: The campaign that toppled Aghlabid rule and established the Fatimid state in Ifriqiya in 909. It brought al-Mahdi from claimant to ruler.
Abu Abdallah al-Shi'i: An Ismaili missionary who built support among the Kutama Berbers and helped establish Fatimid rule in North Africa. His military and political work enabled al-Mahdi's arrival in Ifriqiya.
Fatimid da'wa: The Ismaili missionary network that promoted Fatimid claims to the imamate and recruited adherents. Its organization connected religious allegiance with political support for the new caliph.
Fatimid conquest of Egypt: The Fatimid campaign of 969 that captured Egypt and established Cairo as the dynasty's new center. It fulfilled the dynasty's later expansion beyond the North African base al-Mahdi established.
Kutama revolt: The uprising led by Abu Abdallah al-Shi'i and supported by Kutama forces against Aghlabid rule. Its success made possible al-Mahdi's release and accession.
Kutama: A Berber confederation of northeastern Algeria that became a major military base of the early Fatimid state. Kutama forces backed the revolt that brought al-Mahdi to power.
Mahdia: A coastal city in present-day Tunisia founded by al-Mahdi as a fortified Fatimid capital. Its construction gave the dynasty a defensible seat distinct from former Aghlabid centers.

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QarmatiansCompared with: His claim to leadership diverged from the Qarmatians' rejection of the Fatimid imam.