Qiang people
This ancient tribe is said to be the progenitor of both the modern Qiang and the Tibetan people. There are still many ethnological and linguistic links between the Qiang and the Tibetans. The Qiang tribe expanded eastward and joined the Han people in the course of historical development, while the other branch that traveled southwards, crosses over the Hengduan Mountains, and entered the Yungui Plateau; some went even farther, to Burma, forming numerous ethnic groups of the Tibetan-Burmese language family. Even today, from linguistic similarities, their relative relationship can be seen. They formed the Tibetan ethnicity after the unification of the Tubo kingdom. According to Fei Xiaotong: "Even if the Qiang people might not be regarded as the main source of the Tibetan people, it is undoubtedly that the Qiang people played a certain role in the formation of Tibetan race".