The Period of Khan Inal (Bögü)              

        Inal, the successor son of Kapagan, did not have enough power to take the charge of the state's reins in that critical period of the kingdom. He could not prevent the disorders, and bring the peace to the country. However, the Turkish people were waiting those conditions to be realized by the khan. The duty of saving the state was shouldered by the sons of Ilteriş, Bilge and Kül Tegin; since the Oguzs altogether grew violently. In the year of 716, Kül Tegin had done 5 Oguz attacks, and to the four of them Bilge was joined too. On the inscriptions, there are some passages talking about the Gok-Turks' army getting exhausted and loosing the courage.

 

        All those events were referred to the incapability of the new khan, and were creating the public opinion of withdrew of the quality of being the khan given by God. Fot the country in order to get rid out of this disaster, it was necessary to change the khan. According to the explanations in the Chinese sources, the change was realized by force, probably as a result of the resistance of Bögü. Khan Inal, his brother, nobles and the supporters were killed. The revolution plan was formed by the brothers, Bilge and Kül Tegin, but it was realized by Kül Tegin.