The essays in this volume relate to two major aspects of the nature and effects of the reforms that radically changed the Western Church during the 11th and 12th centuries. The first is the emergence of the Crusades in so far as they developed under papal direction. Special attention is paid to the transformation in Western attitudes to warfare which occurred at this time. Secondly, the author discusses developments in the monastic order, looking in particular at Cluniac, Carthusian and Cistercian monasticism and the political, social and legal aspects of this process.