 In 1303 , Ghazan sent another letter to Edward I , via Buscarello de Ghizolfi , who had also been an ambassador for Arghun . The letter reiterated their ancestor Hulagu 's promise that the Ilkhans would give Jerusalem to the Franks in exchange for help against the Mamluks . That year , the Mongols again attempted to invade Syria , appearing in great strength ( about 80 @,@ 000 ) together with the Armenians . But they were again defeated at Homs on March 30 , 1303 , and at the decisive Battle of Shaqhab , south of Damascus , on April 21 , 1303 . It is considered to be the last major Mongol invasion of Syria . Ghazan died on May 10 , 1304 , and Frankish dreams of a rapid reconquest of the Holy Land were destroyed . 
