sentences:  The death of the Egyptian leader Baibars in 1277 led to disorganization in the Muslim territories, making conditions ripe for a new action by other factions in the Holy Land.The Mongols seized the opportunity, organized a new invasion of Syria, and in September 1280 occupied Bagras and Darbsak, followed by Aleppo on October 20.The Mongol leader Abaqa, taking advantage of his momentum, sent envoys to Edward I of England, the Franks of Acre, King Hugh of Cyprus, and Bohemond VII of Tripoli (son of Bohemond VI), requesting their support for the campaign.