Later, he marched east to the state of Jin, west to Huatuo Mozi and west to Xixia. Finally, on the eve of Xixia's surrender, he died at the foot of Liupan Mountain on 1227. There are many stories about his death:
First of all, he died of illness. According to the "Golden History of Mongolia", when Temujin made an expedition to Xixia in his later years, he was already ill because of his advanced age. Finally, he died of gout under Liupan Mountain. This is now a widely accepted view.
The second theory is that he was killed by lightning. Mongolians believe in heaven. Whenever it thunders, no matter what they are doing, they should stop and bow down devoutly, hoping that God will calm their anger. They think that someone has done something that offends God. At this time, every Mongolian will review his mistakes and pray for God's forgiveness. Temujin led the army to the foot of Liupanshan Mountain and was killed by lightning. People who hold this view believe that Temujin killed too many people in the process of destroying Xixia, so he was punished by God.
The third theory is that the captured princess Xixia was killed. As a grassland nation, Mongolia pays the most attention to money and women in the war. Among Temujin's wives, except the first wife, Kyle Polo, who was married by herself, all the others were foreign princesses or concubines captured in the war. Therefore, those who agree with this view believe that the Mongolian army dedicated the most beautiful princess of Xixia captured in the war to Temujin. At the height of the sexual intercourse, Princess Xixia, with hatred for Mongols, bit Temujin's nakedness, causing him to die in pain.
The fourth theory is that he died of a poisoned arrow when he was on an expedition to Xixia. This statement was put forward by Kyle Poirot. During his trip to China, he heard that Temujin was killed by a poisonous arrow shot by Xixia soldiers.
The fifth theory is that he was killed by a white-robed teenager in Xixia. After the surrender of Xixia kingdom, Temujin was asked to give them a month to prepare, and Mengjun agreed. This month, they found a treasure map in the palace, which was drawn by Li Yuanhao, the founding emperor of Xixia. He seemed to have a premonition that the Xixia kingdom might perish, so he transported a large number of jewels to a place in advance and hid them, leaving a treasure map for future generations in order to rejuvenate the country. The desperate Xixia emperor was overjoyed, so he did not hesitate to escort a martial arts Xixia man out of the city with the lives of the whole city. That night, a white-robed teenager went out of town in the dark. Unfortunately, he was found. In desperation, the white-robed boy saw a man riding a tough horse in the middle of the Mongolian army, so he stabbed the man with a gun, right in the chest, and he was seriously injured and fell off the cliff. The man who was stabbed was really Temujin.
Either way, it can be said that Temujin's death has something to do with Xixia, because Temujin confessed to later generations before he died, and even if Xixia people surrendered, they would all be killed, which shows how much Temujin hated Xixia people.