The document discusses the history of the Crusades from the 11th-13th centuries. It describes how Jerusalem fell to Arab rule in 635 and Seljuk Turks in 1076, persecuting Christians and motivating the Crusades. The First Crusade captured Jerusalem in 1099 and established the Kingdom of Jerusalem. Subsequent crusades were launched including the Second led by Louis VII of France and the Third led by Richard I of England against Saladin. While the crusaders had some successes, they were ultimately unable to retain control of Jerusalem.