Battle of Ain Jalut
When the Mongols were defeated at the Battle of Ain Jalut in 1260, Baibars, the Mamluk sultan of Egypt, began to threaten Antioch, which (as a vassal of the Armenians) had supported the Mongols. Baibars finally took the city in 1268, and all of northern Syria was quickly lost; twenty-three years later, Acre was taken, and the Crusader states ceased to exist.