Abū l-Qāsim Jaʿfar b. Muḥammad al-Qummī (d. 368/978–9 or 369/979–80), known as Ibn Qūluwayh (or perhaps Ibn Qūlūya; Ibn Qūlawayh and Ibn Qawlawayh are both incorrect), was a renowned Imāmī Shīʿī traditionist and jurist. There is little information in the biographical literature about his life. His single attribution (nisba) evidently suggests that he was born in Qum in northwestern Iran, which had been an important Imāmī stronghold since the second/eighth century. While Ibn Qūluwayh’s father, Muḥammad b. Jaʿfar (nicknamed Maslama or al-Jammāl…