Book excerpt: Brill's Companion to Aelred of Rievaulx explores the life, works, and thought of Aelred, Cistercian abbot of Rievaulx Abbey from 1147 to 1167. As well as introducing the three genres of his works —sermons, spiritual teaching, and history— scholars survey such central topics as Marian devotion, love and friendship, the sacramental nature of community, lay spirituality, and saints’ lives. The work also includes the first supplement to the Bibliotheca aelrediana secunda, listing publications by and about Aelred from between 1996 and 2015. Aelred is rapidly becoming one of the best-known and most loved of the 12th-century Cistercians; this book provides welcome new insights into his contributions to the spiritual and political concerns of his place and time. Contributors are Damien Boquet, Pierre-André Burton, Marsha L. Dutton, Elizabeth Freeman, Daniel M. La Corte, Marie Anne Mayeski, Domenico Pezzini, John R. Sommerfeldt, and Katherine Yohe.