During the Liao Dynasty and the Northern Song Dynasty, there were several powerful nomadic tribes on the Mongolian Plateau, such as Mongolia, Tatar and Mirqi. Among them, the most powerful tribal groups with the highest degree of social development are Kelie Department in the middle of Mobei and Naiman Department in the west. In order to seize grasslands, property and slaves, Mongolian nobles waged a long and fierce tribal war with each other.

Genghis Khan, whose real name is Temujin and surname is Borzijitkin, is a descendant of the Mongolian Qiyan family and caught up with the temple name of the Yuan Dynasty. In Mongolian, "Chengkis" means "the sea", praising him as great as the sea. Born in 1 162, died in 1227. 1206, carrying the Great Khan (Emperor) of the Mongolian Empire to unify the Mongolian tribes. During his reign, he conquered the region as far as the Black Sea coast in the west, and was one of the famous great empires in the world history that spanned Europe and Asia. 1June 65438+February 3, 9951day, Genghis Khan was selected as "the first person in the Millennium" by Washington post. This conclusion is based on "who narrowed the earth and brought the world closer in the second 1000 (1000- 1999) in the history of human civilization". Genghis Khan and his descendants launched a series of Western Expeditions for more than 40 years, and established a huge Mongolian empire, connecting the East and the West. . "the first person in the Millennium" deserves its name.

Lu Ye Chucai praised in his poem: "Heavenly soldiers drink from Maxi River and make Xirong offer an image. Flags cover the sky, dust rises to the sky, and strong men are like rainbows. Qin Wang Hanwu said that the soldiers were poor and clapped their hands and laughed. " In Yeluchucai's view, the Mongolian army's expedition to the west is a feat that makes the gods cry and is militarism.