In the third year of Mongolia, Mongolia and Mongolia Khan (1253), Mongolian cavalry attacked Yunnan from Sichuan, Yunnan and Guizhou, passing through the Yi region, which led to the emergence of an anti-Mongolian alliance in the divided Yi region and began to be unified under the name of "Luo Luo". Mongolian nobles also strengthened the wooing of Mozi (chieftain) of Yi people from all over the country, and developed into a chieftain system that enfeoffed the hereditary positions of leaders of all ethnic groups to rule the local people in some frontier ethnic areas. From 1263 to 1287, the Yi Tusi were established in Yuexi, Xichang, Pingshan, Dafang, Zhaotong and Weining.