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In page Nanjing:

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In 210 BC, the First Emperor of Qin visited the east and changed Jinling City to Moling. The area was successively part of the Kuaiji, Zhang, and Danyang prefectures under the Qin and Han dynasties. It was part of the Yangzhou region which was established by Han Wudi in Yuanfeng 5 (106 BC).[citation needed] Nanjing was later made the seat of Danyang Prefecture and served as the chief city in the Yangzhou region for about 400 years from the late Han to the early Tang.[citation needed]