In this original study, Elizabeth R. Alexandrin examines the complex relationships that can be inscribed between medieval Ismā'īlī thought as an intellectual tradition with a devotional practice of reliance on the imām, and as a politico-esoteric system that redefined governance during the Fāṭimid caliphate in the eleventh century. Alexandrin's work is a departure from recent Western scholarship that focuses on similarities among early Islamic traditions. She argues instead that, under the guidance of the Fāṭimid Ismā'īlī chief...