Of the many campaigns during the Middle Ages, few are as remarkable or seemingly impossible to win at the start as the First Crusade (1095-99), and the true crowning achievement of that crusade, which resulted in two centuries of Western European Christian states in the Middle East and the permanent firing of the European imagination, was the conquest of Jerusalem on July 15, 1099 after three weeks of siege. That victorious siege came four years after the call for a crusade first went out, and had the Crusaders not taken Jerusalem, the First Crusade would not likely have been followed by any more and the campaign might have been no more than an historical footnote of what could have been.
Despite the successful First Crusade, the Crusader States were relatively small and weak, and while they tried to be a bulwark of Christianity in the Holy Land, the Crusader States were reconquered centuries before modern European colonialism began. Nonetheless, the Crusades and the Crusader States galvanized the Christians of Western Europe to expand their world. While it remains unclear how much that world expanded in practical terms such as trade, or how it affected later attitudes during the expansion to the New World and other regions, it definitely engaged the European mind in both positive and negative ways. As such, the crusades soon achieved near-mythic status in the European literature and remain among the most important events of the Middle Ages.
At the same time, the Crusader States were not one homogenized region but actually several distinct territories that had their own unique histories and interests. In fact, many of them were founded a century apart, with the Kingdom of Antioch established in 1097 and the Duchy of Cyprus in 1191, and they stretched across the Near East and the Mediterranean. As such, each one had different political, religious, and economic characteristics.
