Li Zhengji
The Protectorate General to Pacify the East was installed by the Tang government to rule and keep control over the former territories of the fallen Goguryeo. It was first put under the control of Tang General Xue Rengui, but was later replaced by Bojang due to the negative responses of the Goguryeo people. Bojang was sent into exile for assisting Goguryeo revival movements, but was succeeded by his descendants. Bojang's descendants declared independence from Tang during the same period as the An Lushan Rebellion and Li Zhengji (Yi Jeong-gi in Korean)'s rebellion in Shandong. The Protectorate General to Pacify the East was renamed "Little Goguryeo" until its eventual absorption into Balhae under the reign of Seon.