As indicated by his nisba (Ar. gentilic), Zechariah ben Judah (al-)Aghmāṭī was either born or reared in the town of Aghmat, in southern Morocco. He is known from his single extant work—an exegetical compendium arranged primarily around the Halakhot Rabbati of Isaac ben Jacob al-Fāsī. The extant portions of this massive work are contained primarily in British Library MSS Or. 11361 (on BT Berakhot, Shabbat, and ʿEruvin) and Or. 10013 (on BT Bava Qamma, Bava Meṣiʿa, and Bava Batra). Also surviving is a small portion on Moʿed Qaṭan. Whether he proceeded beyond Bava Batra and complete…