Excerpts from Books and Wikipedia
"The Crusader states, also known as Outremer, were a number of mostly 12th- and 13th-century feudal Christian states created by Western European crusaders in Asia Minor, Greece and the Holy Land, and during the Northern Crusades in the eastern Baltic area. The name also refers to other territorial gains (often small and short-lived) made by medieval Christendom against Muslim and pagan adversaries. The Crusader states in the Levant were the Kingdom of Jerusalem, the Principality of Antioch, the County of Tripoli and the County of Edessa. . . . The first four Crusader states were created in the Levant immediately after the First Crusade:
• The first Crusader state, the County of Edessa, was founded in 1098 and lasted until 1150.
• The Principality of Antioch, founded in 1098, lasted until 1268.
•The Kingdom of Jerusalem, founded in 1099, lasted until 1291, when the city of Acre fell. [Wikipedia]