Ismailism

Ismāʿīlism (Arabic: الإسماعيلية‎ al-Ismāʿīliyya; Persian: اسماعیلیان‎Esmāʿiliyān; Urdu: إسماعیلی‎ Ismāʿīlī) is the second largest branch of Shia Islam after the Twelvers (Ithnāʿashariyya). The Ismāʿīlī get their name from their acceptance of Ismāʿīl ibn Jaʿfar as the appointed spiritual successor (Imām) to Jaʿfar aṣ-Ṣādiq, wherein they differ from the Twelvers, who accept Mūsà al-Kāżim, younger brother of Ismāʿīl, as the true Imām.