During Arghun's reign, the Egyptian Mamluks were continuously reinforcing their power in Syria. The Mamluk Sultan Qalawun recaptured Crusader territories, some of which, such as Tripoli, had been vassal states of the Il Khans. The Mamluks had captured the northern fortress of Margat in 1285, Lattakia in 1287, and completed the Fall of Tripoli in 1289.