John Van Engen is Andrew V. Tackes Professor of History at the University of Notre Dame and author of Rupert of Deutz, among other works.
This is a painstakingly detailed narrative into which analysis is seamlessly woven. . . . A major contribution on several fronts. -Church History A grand and important book not only for those bitten by medieval studies but for all interested in Western civilization's transition from medieval to modern. -American Historical Review This will be the definitive study of a noteworthy religious movement of the later Middle Ages. Van Engen has mined the libraries and archives with extraordinary thoroughness and has found a wealth of new knowledge. -Robert E. Lerner, Northwestern University A wonderfully rich and rewarding book. . . . This work will, unquestionably, remain the standard work for years to come. -Speculum