Abdullah al-Mahdi Billah (r. 909-934) (Arabic: عبد الله بن الحسين بن أحمد بن عبد الله بن محمد بن اسماعيل بن جعفر المهدي), often referred to as Ubayd Allah, is the founder of the Fatimid dynasty, the only major Shi'a caliphate in Islam, and established Fatimid rule throughout much of North Africa.
Read more about Abdullah Al-Mahdi Billah: History