Abū Manṣūr al-ʿIjlī, who was given the title (laqab) of al-Kisf, was a well-known Shiʿi extremist (ghālī), who lived in the early 2nd/8th century and whose followers were known as the Manṣūriyya. He harboured great political ambitions, as can be seen in his life and teachings, which ultimately brought about his death at the hands of Umayyad agents. Al-Qalhātī (p. 288) refers to him as Manṣūr b. Saʿīd.

According to Saʿd b. ʿAbd Allāh al-Ashʿarī (p. 46), Abū Manṣūr was from the ʿAbd al-Qays tribe, while all other sources refer to him as al-ʿIjlī (see al-Ashʿarī, ʿ…