Abū Yaʿqūb Yūsuf ibn Ibrāhīm al-Baṣīr (Heb. Joseph ben Abraham ha-Roʾeh) is one of the chief representatives of the Golden Age of Karaite Judaism in Jerusalem during the late tenth and early eleventh centuries. As a theologian (mutakallim; see Kalām ) and authority on Karaite law, he made a major contribution to the efflorescence of the Jerusalem school of Karaite learning which exerted considerable influence over the communities of the Karaite diaspora and served as the foundation of Karaite literature and culture for generations.
Owing to the absence of a detailed account of…