In his remarkable book, Jonathan Phillips explores the conflict of ideas, beliefs and cultures and shows both the contradictions and diversity of holy war. He draws on contemporary writings - on chronicles, songs, sermons, travel diaries and peace treaties - to throw a brilliant new light on people and events we thought we knew well. Although the notion of fighting for one's faith fell into disrepute in the Enlightenment, Phillips traces the crusading impulse from the bloody conquest of Jerusalem in the First Crusade and the titanic struggle between Richard the Lionheart and Saladin up to the present day - to George W. Bush's characterisation of the war on terrorism as a crusade.