What was the Tuyuhun state in the Qinghai region?

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Qinghai Yellow River (Huang He), eastern Qinghai province, China.

The Tuyuhun was a state established by a branch of the Xianbei tribe during the period of political fragmentation that followed the decline of the Han dynasty.1

Based in the Qinghai region, the state extended its influence eastward into present-day Gansu province. The Tuyuhun state maintained its presence in the region for more than three centuries before a Lhasa-based dynasty assumed control over the area in the 7th century.1