Muhammad al-Taqi

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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 ʿAbad Allāh (al-Wāfī Ahmad) Ahmad (al-Taqī Muhammad) Ḥusayn (ar-Raḍī ʿAbd Allāh) ʿAbd Allāh al-Mahdī bi'l-Lāh al-Qāʾim al-Manṣūr Maʿad al-Muʿizz li-Dīn Allāh Nizār al-ʿAzīz biʾllāh, Manṣūr al-Ḥākim bi-Amr Allāh ʿAlī al-Ẓāhir li-iʿzāz Dīn Allāh Maʿad al-Mustanṣir bi'l-Lāh Nizār al-Muṣṭafā li-Dīn’il-Lāh / Aḥmad al-Mustāʿlī bi'l-Lāh Manṣūr al-Āmir bi-Aḥkām’il-Lāh ʿAbd al-Majīd al-Ḥāfiz li-Dīn Allāh / Abu'l-Qāsim al-Tayyib
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Abu al-Husayn Ahmad ibn Abd Allah ibn Muhammad ibn Isma'il (Arabic: أَبُو ٱلْحُسَيْن أَحْمَد ٱبْن عَبْد ٱللَّٰه ٱبْن مُحَمَّد ٱبْن إسْماعِيل, romanized: Abū al-Ḥusayn Aḥmad ibn ʿAbd Allāh ibn Muḥammad ibn Ismāʿīl; c. 790–840), commonly known as Muhammad al-Taqi (Arabic: مُحَمَّد ٱلْتَقِيّ, romanized: Muḥammad al-Taqī, lit. 'Muhammad the pious'), was a descendant of the Islamic prophet Muhammad and the ninth of the Isma'ili Imams, succeeding his father, Ahmad al-Wafi (d. 828). Like his father, he lived primarily in Salamiyah, and Abd Allah ibn Maymun al-Qaddah, the chief missionary (da'i), continued to serve as the hijab (lit. 'cover') for him. Known by the title Ṣāḥib al-Rasāʾil (lit. 'lord of the epistles'), al-Taqi is said to have prepared with his followers an encyclopedic text called the Encyclopedia of the Brethren of Purity (Rasāʾil Ikhwān al-ṣafā). He died in 840 in Salamiyah and was succeeded by his son al-Husayn.

With the death of Ja'far al-Sadiq in 148/765, Isma'il (d. 158/775) and Muhammad (d. 197/813), the gravity of persecutions of the Abbasids had considerably increased. The Isma'ili Imams were impelled to thicken their hiding, therefore, the first dawr al-satr came into force from 197/813 to 268/882, wherein the Imams were known as al-a'imma al-masturin (lit. 'the concealed Imams'). The concealment ended with the establishment of the Fatimid caliphate (r. 909–1171).