Christopher Brooke is Dixie Professor Emeritus of Ecclesiastical History at the University of Cambridge and a Life Fellow of Gonville and Caius College. His numerous previous publications include "From Alfred to Henry III, 871-1272" (1961), "Europe in the Central Middle Ages" (Third Edition, 2000), "The Twelfth Century Renaissance" (1969), "The Structure of Medieval Society" (1971), "The Monastic World 1000-1300" (with Wim Swaan, 1974) and "The Medieval Idea of Marriage" (1989).