This is a very clever book, an exciting detective story based on acute paleographic and political analysis. -- Mary Stroll American Historical Review This book is a valuable contribution to an understanding of the controversy over the Eucharist that swirled around Berengar, thescholasticus of Tours, in the eleventh century... an excellent example of the virtues of collaborative scholarship. -- Gary Macy Catholic Historical Review The handsome volume will help to make an immensely important moment in European culture accessible and comprehensible for students and scholars alike. -- Miri Rubin Ecclesiastical History Will be of interest to all students of the intellectual and ecclesiastical history of the eleventh and twelfth centuries. -- William North Speculum