Description : Shangjing Longquanfu (Chinese: 上京龍泉府) or Sanggyeong Yongcheonbu (Korean: 상경용천부), also known as Shangjing/Sanggyeong (上京, 상경), Huhan/Holhan Fortress (忽汗城, 홀한성), is an archaeological site in Ning'an, Heilongjiang, China. It was the capital of the Balhae (Bohai) Kingdom from 756 to 785, and again from 793 to 926. The site is located in about 3 kilometres (1.9 mi) from the modern town of Dongjingcheng (东京城), and the ruined city is also colloquially called "Dongjingcheng". The site has been protected since the 1960s. The Chinese government has established the Bohai Shangjing National Archaeological Park and an archaeological museum at the site. Balhae was 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. In 756, during the reign of King Mun, Shangjing Longquanfu was established as the permanent capital near Lake Jingpo, south of today's Ning'an, Heilongjiang, China.
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