毘伽可汗
The Old Turkic inscriptions on these monuments were written by Yollug Tigin who was nephew of Bilge Khagan. These inscriptions together with the Tonyukuk inscription, are the oldest extant attestation of that language. The inscriptions clearly show the sacred importance of the region, as evidenced by the statement, "If you stay in the land of the Ötüken, and send caravans from there, you will have no trouble. If you stay at the Ötüken Mountains, you will live forever dominating the tribes!"