Abū l-Ḥasan (or possibly Abū l-Ḥusayn) ʿAlī b. al-Ḥusayn b. Warsand al-Bajalī , was an early third/ninth-century Maghribī author of books of Shīʿī legal traditions and the founder of a sect called, after him, al-Bajaliyya. The earliest known citation of his writings occurs in a work of the Fāṭimid authority Qāḍī al-Nuʿmān, itself from the first half of the fourth/tenth century. The Bajaliyya upheld the imāmate of Mūsā al-Kāẓim b. Jaʿfar al-Ṣādiq (d. 183/799) but severed the line of