Yenisei Kyrgyzes in the Late Antique times were a part of the Tiele tribes.
From the en.wikipedia.org
Yenisei also sank with the only map indicating the position of the mines.
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A Russian river in Siberia; rises in mountains near the Mongolian border and flows generally northward into the Kara Sea
Enets: the Uralic language spoken by the Yeniseian
The Yenisei (Russian: u0415u043Du0438u0441u0435u0301u0439, Jenisej; Mongolian: u0415u043Du0438u0441u0435u0439 u043Cu04E9u0440u04E9u043D, Yenisei mu00F6ru00F6n); Buryat: u0413u043Eu0440u043Bu043Eu0433 u043Cu04AFu0440u044Du043D, Gorlog mu00FCren; Tyvan: u0423u043Bu0443u0433-u0425u0435u043C, Ulug-Hem; Khakas: u041Au0438u043C u0441u0443u0433, Kim sug also Romanized Yenisey, Enisei, Jenisej, is the largest river system flowing to the Arctic Ocean. It is the central of the three great Siberian rivers that flow into the Arctic Ocean (the other two being the Ob and the Lena)...