This is the first scholarly history of the relations between Byzantium and the Crusader States of Syria and Palestine. Ralph-Johannes Lilie sets out to explore the policies and principles which shaped contacts between the Eastern Empire, the Crusader States, and the nations of Western Europe when the Crusaders came. Originally published to much acclaim in German, Byzantium and the Crusader States has been revised by the author for the English edition and presented in a lucid and scholarly translation.