[4] In the Western Han Dynasty, the state of Quyang Hou was added to the present-day Dingyuan region, with the three administrative divisions still under Jiujiang's jurisdiction.

[4] Frequent wars during the Southern and Northern Dynasties led to constant changes in control over the area of present-day Dingyuan County.

Following Northern Wei's capture, the area was briefly named Xipei County before being returned to the South during the Chen Dynasty in 573 AD.

In 745 AD, during the fourth year of the Tianbao reign, Dingyuan County relocated its seat to Dingcheng, where it has remained since.

Throughout the Song-Jin wars, control of the region shifted frequently, but it ultimately remained under Southern Song authority.

Despite frequent changes in governance until the Republic of China period, the establishment of Dingyuan County remained consistent.