This book is concerned with the changes in religious thought and institutions from the late eleventh century to the third quarter of the twelfth. It concentrates on monks and nuns, but also takes into consideration hermits, recluses, wandering preachers, crusaders, penitents, and other less organised forms of religious life. In particular it studies the variety of reform movements, the relation of the reformers to each other and the outside world, and their spirituality and motivation as reflected in their writings and activities.