Isma'il ibn Jafar
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Isma'il ibn Jafar (Arabic: إسماعيل بن جعفر, c. 721 CE/103 AH - 755 CE/138AH) was the eldest son of the sixth Shia Imam, Jafar as-Sadiq. To protect him from persecution, his father sent him into hiding and publicly declared him deceased.
As-Sadiq had, at one time, designated his son Isma’il as his successor, but Isma’il died before his father. Most Shi’i followers turned to the eldest surviving son of al-Sadiq, Abd-Allah, who claimed a second designation. When Abd-Allah died within weeks without an heir, many turned again to another son of as-Sadiq, Musa al-Kazim. This crisis of succession led to doubts about the true designation of Jafar as-Sadiq and many clung to the original designation of Isma’il and proclaimed the son of Isma’il.
Those who believe that Isma'il was the rightful successor to Jafar are known as Ismailis (or Seveners), while other follwers of Musa Kazim are known as Twelvers, They went on to recognize 12 Imams. The Nizari Ismaili Shias follow a living Imam directly descended from Isma'il ibn Jafar.