Möngke Khan, a Tengri Mongol from the house of Borjigin, was the fourth Khagan of the Mongol Empire. Grandson of the founder, and the first Emperor of the Mongol Empire, Genghis Khan, Möngke became the first Khagan from the Toluid line. He was the last man to hold the title of the great khan. Following the short rule and then the death of Guyuk Khan, his widow Oghul Qaimish ruled as regent over the Mongol Empire before Möngke took over as 4th Khagan of the empire. Möngke’s reign was marked with quick expansion as the Mongols were successful in conquering Syria, Iraq, and the kingdom of Dali. Significant reforms were introduced during his rule in improving the empire’s administration. The grandeur attained by his capital, Karakorum, in central Mongolia was remarkable. He led campaigns in China and conquered southern China’s Nanchao kingdom. He led his army against the Song dynasty. Mongke died in the field during the siege of Diaoyu (now Chongqing).