The Ayyubid and Mamluk periods were some of the most intellectually fecund in Islamic history. Megan H. Reid's book, which traverses three centuries from 1170 to 1500, recovers the stories of medieval men and women who were renowned not only for their intellectual prowess but also for their devotional piety. Through these stories, the book examines trends in voluntary religious practice that have been largely overlooked in modern scholarship. This type of piety was distinguished by the pursuit of God's favor through additional rituals, which emphasized the body as an instrument of worship and...