History of Mongolia
Although the Xiongnu finally had been split into two parts in AD 48, the Xianbei (or Hsien-pei in Wade–Giles) had moved (apparently from the east) into the region vacated by the Xiongnu. The Xianbei were the northern branch of the Donghu (or Tung Hu, the Eastern Hu), a proto-Mongol group mentioned in Chinese histories as existing as early as the 4th century BC. The language of the Donghu is believed to be proto-Mongolic to modern scholars. The Donghu were among the first peoples conquered by the Xiongnu. Once the Xiongnu state weakened, however, the Donghu rebelled. By the 1st century AD, two major subdivisions of the Donghu had developed: the proto-Mongolic Xianbei in the north and the Wuhuan in the south.
Xichang
The Qiongdu were the local people at the time of contact with China. The county of Qiongdu is attested in the area from the Han dynasty. Under the Song, a local lord was given the title of "King of the Qiongdu" ("Qiongdu Wang"). The area formed part of the medieval Kingdom of Dali and was subdued by the Mongolians from 1272–4, after which it was incorporated into Yunnan of the Yuan dynasty. It was organized as the Jiandu Ningyuan duhufu, qianhufu, or wanhufu but continued to be often known as Jiandu. In the book of his travels, Marco Polo recorded that the people of Jiandu and its hinterland used no coins but rods of gold bullion reckoned in '. Small change was made using half-catty pieces of molded salt, each reckoned as one-eightieth of a ' of pure gold. Under the Qing, it was officially known as Ningyuan Commandery but also continued to be referenced under the old name Jianchang. In the 19th century, it was the center of Sichuan's production of "white wax".