毗伽可汗
They were erected by the Göktürks in the early 8th century. They commemorate the brothers Bilge Khagan (683-734) and Kul-Tegin (684-731), one a politician and the other a military commander. Both were descendants of Ilterish Qaghan of the Second Turkic Khaganate, which was a prominent Turkic nomadic society during the Tang dynasty.