Xue Rengui
Silla thus unified most of the Korean peninsula in 668, but the kingdom's reliance on China's Tang Dynasty had its price. Tang set up the Protectorate General to Pacify the East, governed by Xue Rengui, but faced increasing problems ruling the former inhabitants of Goguryeo, as well as Silla's resistance to Tang's remaining presence on the Korean Peninsula. Silla had to forcibly resist the imposition of Chinese rule over the entire peninsula, which lead to the Silla–Tang Wars, but their own strength did not extend beyond the Taedong River.