Bilge Khagan
Upon the death of Qapagan Khaghan, his son Inel Qaghan attempted to illegally ascend to the throne, defying the traditional Lateral succession law, but Kül Tigin refused to recognize the takeover. He raised an army, attacked, and killed Inel, Ashina Duoxifu and his trusted followers. He placed his elder brother Bilge Khagan on the throne, and took the title of Shad, an equivalent of commander-in-chief of the army, for himself.