The Crusades (Essential Histories, 1);

Born amid immense suffering and bloodshed, the Kingdom of Jerusalem remained a battlefield for almost 200 years. The Crusades gave rise to the Military Orders of the Templars and Hospitallers, and were a backdrop to the careers of some of history's most famous leaders including Richard 'The Lionheart' and Saladin. On occasion the savagery of the Crusaders left their opponents reeling, creating frictions that survived for more than 700 years. At the same time, as this book lavishly illustrates, art, architecture and learning all benefited from new knowledge the Crusaders brought back from the East.