sentences:  In 1299, he made the first of what were to be three attempts to invade Syria.As he launched his new invasion, he also sent letters to the Franks of Cyprus (Henry II, King of Cyprus; and the heads of the military orders), inviting them to come join him in his attack on the Mamluks in Syria.The Mongols successfully took the city of Aleppo, and were there joined by their vassal King Hethum II, whose forces participated in the rest of the offensive.