2. 1206, Genghis Khan Temujin unified Mobei, established Great Mongolia, and began to expand to the outside world, successively attacking and destroying Western Liao, Xixia, Huala, Eastern Xia, Jin and other countries.

3. After the death of Mongolian Khan, the dispute between Ali Bug and Kublai Khan was triggered, which led to the division of Mongolia. 1260, Kublai Khan, established the "great unity" of the Yuan Dynasty. 127 1 year, Kublai Khan changed his title to "Dayuan" in the Book of Changes, and moved the capital to Yanjing the following year, calling it Dadu.