This is a general account of the history and architecture of Crusader castles in the Kingdom of Jerusalem, County of Tripoli and Principality of Antioch between 1099 and 1291, the years during which the Crusaders had a permanent presence on the Levantine coast. Extensive use is made of contemporary chronicles to show the reasons why castles were built and how they were used in peace and war. The book is fully illustrated by photographs, drawings and plans, and contains a comprehensive bibliography.