Analysis of information sources in references of the Wikipedia article "Protectorate General to Pacify the East" in English language version.
安東都護府總章元年九月，司空李勣平高麗。高麗本五部，一百七十六城，戶六十九萬七千。其年十二月，分高麗地為九都督府，四十二州，一百縣，置安東都護府於平壤城以統之。In the ninth month of the first year of the Zongzhang era [668], the Minister of Works Li Ji pacified Goguryeo. Originally Goguryeo had 5 regions, 176 cities, and 697,000 households. In the twelfth month of that year, Goguryeo's territory was divided into 9 commanderies, 42 prefectures, and 100 counties. The Andong Protectorate was situated at Pyeongyang to govern it.
上元三年二月，移安東府於遼東郡故城置。儀鳳二年，又移置於新城。In the second month of the third year of the Shangyuan era [676], the seat of Andong was moved to the Old City of Liaodong. In the second year of the Yifeng era [677], it was move again, this time to Xincheng.
開元二年，移安東都護於平州置。天寶二年，移於遼西故郡城置。In the second year of the Kaiyuan era [714], the Andong Protectorate was moved to Ping Prefecture. In the second year of the Tianbao era [743], it was moved to the old commandery seat of Liaoxi.
