Study on the Relationship between the Tang Dynasty and Turgesh
Since the Chuigong period,the strategy of enfeoffment of the Ashina clan as the head of the Western Turkic"Ten Surnames"(十姓)by the Tang Dynasty had lost its effectiveness,and the second East Turkic Khanate subsequently invaded Central Asia.Turgesh gradually took over the control of the"Ten Surnames",developed and grew stronger.Contact between the Tang Dynasty and Turgesh began,yet the Tang continued to employ the strategy of conferring the Ashina clan as the head of the"Ten Surnames"for borderland control.The second Khan of Turgesh,Suoge(娑葛),met his demise in the war against the invasion of the second East Turkic Khanate after resistance.During the reign of Sulu(Khan,as a result of his meritorious efforts in resisting the invasion of Dashi,the Tang Dynasty's reliance on the Turgesh increased,and the relationship between the Tang Dynasty and Turgesh further developed.After Turgesh split into two surnames,Hei and Huang,there were only occasional records of Turgesh Hei in Chinese historical records.