In the summer of 1299, Het'um I's grandson, King Het'um II, again facing threats of attack by the Mamluks, asked the Mongol khan of Persia, Ghâzân, for his support. In response, Ghâzân marched towards Syria and invited the Franks of Cyprus (the King of Cyprus, the Templars, the Hospitallers, and the Teutonic Knights), to join his attack on the Mamluks. The Mongols took the city of Aleppo, where they were joined by King Het'um. His forces included Templars and Hospitallers from the kingdom of Armenia, who participated in the rest of the offensive. The combined force defeated the Mamluks in the Battle of Wadi al-Khazandar, on December 23, 1299. The bulk of the Mongol army was then obligated to retreat. In their absence, the Mamluks regrouped, and regained the area in May 1300.