《北史·列传·卷八十二》
国王喜爱修建宫室，在平壤建都，也叫长安城，东西有六里，沿着山谷弯曲，南临氵贝水。
其王好修宫室，都平壤城，亦曰长安城，东西六里，随山屈曲，南临浿水。
The king loved to build palaces, built the capital in Pyongyang, and also called it Chang'an City. It was six li from east to west, winding along the valley and facing the Shuibei River in the south.