The Kingdom of Jerusalem was a Christian kingdom established in the Levant in 1099 after the First Crusade. It lasted nearly two hundred years, from 1099 until 1291 when the last remaining possession, Acre, was destroyed by the Mamluks.
At first the kingdom was little more than a loose collection of towns and cities captured during the crusade. At its height, the kingdom roughly encompassed the territory of modern-day Israel and the Palestinian territories. It extended from modern Lebanon in the north to the Sinai Desert in the south, and into modern Jordan and Syria in the east. There were also attempts to expand the kingdom into Fatimid Egypt. Its kings also held a certain amount of authority over the other crusader states, Tripoli, Antioch, and Edessa.