|Revised Romanization||Sanggyeong Yongcheonbu|
Shangjing Longquanfu (Chinese: 上京龍泉府) or Sanggyeong Yongcheonbu, also known as Shangjing (상경, 上京) or Sanggyeong, Holhan Fortress (홀한성, 忽汗城) or Dongjingcheng (东京城), was the capital city of Balhae in 756–785 and 793–926.
Balhae was originally founded at the Dongmo Mountain by Dae Jo-yeong. However, Balhae set up five capitals to rule its territories, and also transferred the main seat of the government several times because stabilizing and strengthening central rule over various ethnic tribes in its realm, which was expanded temporarily.
Sanggyeong had an outer fortress built squarely around two inner cities called as the "Gungseong" (Palace city) which housed royal palace of Balhae and the "Hwangseong" (Imperial city), which contained the government organizations. The perimeter of its outer fortress measures approximately 17 km.
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