Isma'il ibn Ja'far

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Early leaders Ali Hasan Husayn al-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
Incumbent leaders Nizārī Ismā'īlī Imām: Aga Khan IV Musta'li Ismaili-Taiyabi Dā'ī al-Mutlaqs: Alavi Bohra: Haatim Zakiyuddin Dawoodi Bohra: Mufaddal Saifuddin Qutbi Bohra: Taher Fakhruddin
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Isma'il ibn Ja'far (Arabic: إسْماعِيل ٱبْن جَعْفَر ٱلْمُبَارَك, romanized: Ismāʿīl ibn Jaʿfar al-Mubārak) was the eldest son of Ja'far al-Sadiq and the sixth Imam in Isma'ilism. He carried the epithet of al-Mubarak, on the basis of which one of the earliest Isma'ili groups became designated as the Mubarakiyya.

It seems likely that the Mubarakiyya, were originally supporters of Isma'il before acknowledging Muhammad ibn Isma'il as their Imam. At any rate, Mubarakiyya was thus one of the original names of the nascent Isma'iliyya, a term coined by later heresiographers. A faction of the Mubarakiyya later developed into the Fatimid Isma'ilis, upholding the continuity of the Imamate in the progeny of al-Mubarak, acknowledging al-Mubarak himself as their sixth Imam. This enumeration was subsequently retained by the various branches of the Isma'ili.

A major crisis arose among the Shia after the death of Ja’far al-Sadiq, who had five sons. Abd Allah al-Aftah and Isma'il al-Mubarak were the eldest sons by his first wife Fatima, a granddaughter of Hasan Ibn Ali. Al-Mubarak was probably the second son of al-Sadiq. The exact date and circumstances of al-Mubarak's death also remain obscure. According to some Isma'ili authors, al-Mubarak survived al-Sadiq. Some sources, mainly Twelver texts, report that al-Mubarak died during the lifetime of al-Sadiq—but those same sources also report that al-Mubarak was seen several days later in Basra, suggesting that he did not really die but was sent away out of Medina.