Radi Abdullah
ʿAbdullāh ar-Raḍī, is the tenth Isma'ili Imam. He is successor to the ninth Imam, Muhammad at-Taqi, and the father of Abdullah al-Mahdi Billah, the Imam who founded the Fatimid Caliphate.
The eighth to tenth Isma'ili Imams were hidden from the public because of threats from the Abbasid Caliphate and were known by nicknames. However, the Dawoodi Bohra in their religious text, Taqqarub, claim to have the true names of all 21 imams in sequence, including those of the hidden Imams: the eighth Imam Ahmad al-Wafi, the ninth Imam Muhammad at-Taqi, and the tenth Imam, Raḍī Abdullah.
