Dulo clan
In 630, Dulo clan of tribes together with Karluks revolted against Tong the most successful ruler of the empire who was supported by the rival Nushibi faction. Külüg Sibir murdered Tong who was his nephew and declared himself as the khagan (emperor) with the support of Dulo clan. According to S. G. Klyashtorny and T. I. Sultanov he was trying to end the tension between the khagan and the vassal tribes. However Nushibi faction didn't accept his title and supported Tong's son to throne. Although Külüg Sibir asked for Dulu support, next year he had to abdicate. He escaped to Altay Mountains where he was killed by Nushibi partisans.