Radi Abdullah
ʿAbdullāh ar-Raḍī, (actual name: Abu ʿAlī[1] al-Ḥusayn ibn Aḥmad ibn ʿAbd Allāh ibn Muḥammad ibn Ismāʿīl (Arabic: ﺍلحسين بن أحمد بن عبد اللّه بن محمد بن إسماعيل; born 219 AH, died 268AH or 881 AD in Askar, Syria; Imamate: 225-268AH) surnamed al-Raḍī/al-Zakī) is the tenth Isma'ili Imam. He is son and successor to the ninth Imam, Ahmad ibn Abadullah (Muhammad at-Taqi), and the father of Abdallah al-Mahdi Billah, the Imam who founded the Fatimid Caliphate.
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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 Abadullah ibn Muhammad (Ahmad al-Wafi), the ninth Imam Ahmad ibn Abadullah (Muhammad at-Taqi), and the tenth Imam Husayn ibn Ahmad (Raḍī Abdullah).
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