Möngke Khan, also transliterated as Mongke, Mongka, Möngka, Mangu or Mangku, was the fourth Great Khan of the Mongol Empire from 1251 to 1259. He was the first Great Khan from the Toluid line. Under Möngke, the Mongols conquered Iraq and Syria as well as the Tai kingdom of Nan-chao and the area of present-day Vietnam.He made significant reforms to improve the administration of the Empire.