Seogyeong

Seogyeong (nowadays Pyongyang) is located on the Taedong River. It's a city part of the Goreyo's kingdom.

In 668, Pyongyang became the capital of the Protectorate General to Pacify the East, established by the Tang Dynasty of China. However, by 676, Pyongyang was taken by Silla but left on the border between Silla and Balhae (Bohai) until the time of the Goryeo dynasty, when the city was revived as Sŏgyŏng (Hangul: 서경; Hanja: 西京; "Western Capital"), although it was never actually a capital of Goryeo.