Radi Abdullah

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Early Imāms Ali Hasan Husayn as-Sajjad al-Baqir Jaʿfar al-Ṣādiq Ismāʿīl ibn Jaʿfar al-Mubārak Muhammad ibn Ismāʿīl ash-Shākir ʿAbadu l-Lāh (al-Wāfī Ahmad) Ahmad (al-Taqī Muhammad) Ḥusayn (ar-Raḍī ʿAbdillāh) ʿAbdu l-Lāh al-Mahdī bi l-Lāh al-Qāʾim al-Manṣūr al-Muʿizz al-ʿAzīz al-Ḥākim al-Ẓāhir al-Mustanṣir bi l-Lāh Nizār al-Muṣṭafā li-Dīn’il-Lāh / Aḥmadu l-Mustāʿlī bi l-Lāh Manṣūr al-Āmir bi-Aḥkām’il-Lāh Abu l-Qāsim al-Tayyib
Nizari Ismaili and Taiyabi Da'is  Nizārī Ismā'īlī Aga Khan IV Taiyabi-Musta’li Ismailis Dawoodi Bohra Disputed between Mufaddal Saifuddin and Taher Fakhruddin Sulaymani Al-Fakhri Abdullah Alavi Bohra Haatim Zakiyuddin
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ʿAbdullāh ar-Raḍī, (actual name 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 successor to the ninth Imam, Muhammad at-Taqi (Ahmed ibn Abadullah), 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 (Abadullah), the ninth Imam Muhammad at-Taqi, and the tenth Imam, Raḍī Abdullah.

The tree of the Imamate of the Isma'ilis

Nizari Imams
Ali Husayn ibn Ali Ali ibn Husayn Zayn al-Abidin Muhammad al-Baqir Ja'far al-Sadiq Isma'il ibn Jafar Muhammad ibn Isma'il Ahmad al-Wafi Muhammad at-Taqi Radi Abdullah Abdullah al-Mahdi Billah al-Qa'im bi-Amr Allah al-Mansur Billah Al-Mu'izz li-Din Allah Al-Aziz Billah Al-Hakim bi-Amr Allah Ali az-Zahir al-Mustansir Billah Nizar al-Hādī al-Mutadī al-Qāhir Hassan II Nur al-Din Muhammad II Jalaluddin Hasan ‘Alā’ ad-Dīn Muḥammad III Rukn al-Din Khurshah Shamsu-d-Dīn Muḥammad Qāsim Shāh Islām Shāh Muḥammad ibn Islām Shāh al-Mustanṣir billāh II ʿAbdu s-Salām Shāh Gharīb Mīrzā Abū Dharr ʻAlī Murād Mīrzā Dhū-l-Fiqār ʻAlī Nūru d-Dīn ʻAlī Khalīlullāh II ʻAlī Nizār II as-Sayyid ʻAlī Ḥasan ʻAlī Qāsim ʻAlī Abū-l-Hasan ʻAlī Shāh Khalīlullāh III Aga Khan I Aga Khan II Aga Khan III Aga Khan IV