Religious warfare has been a recurrent feature of European history. In this intelligent and readable new study, the distinguished Crusade historian Norman Housley describes and analyses the principal expressions of holy war in the period from the Hussite wars to the first generation of the Reformation. The context was one of both challenge and expansion. The Ottoman Turks posed an unprecedented external threat to the 'Christian republic', while doctrinal dissent, constant warfare between states, and rebellion eroded it from within. This is a major contribution to both Crusade history and the study of the Wars of Religion of the early modern period. Professor Housley explores the interaction between Crusade and religious war in the broader sense, and argues that the religious violence of the sixteenth and seventeenth centuries was organic, in the sens that it sprang from deeply rooted proclivities within European society.