Xiongnu is a nomadic people in ancient Mongolian Gobi grassland, whose ancestral home is in the southeast of Altai Mountain, west of Daxinganling, south of Mongolian grassland, northeast of Qinghai-Tibet Plateau and northwest of Gobi in North China Plain. It is a mixture of ancient North Asian race and primitive Indo-European race. During the Qin and Han Dynasties, Huns were called Hulu, and later generations took it as a general term for northern tribes hostile to the Central Plains.