Dai Commandery

The name derives from the White Di kingdom of Dai, conquered by the Zhao family of Jin.

[7] During the interregnum following Qin's collapse, Dai was one of the Eighteen Kingdoms established by Xiang Yu.

Under the Han, Dai Prefecture formed part of the province of Bingzhou and oversaw 18 counties,[10] both within and beyond the Great Wall.

During China's Three Kingdoms period, Wei returned the commandery seat to Daixian (near present-day Yuzhou, Hebei).

During China's Sixteen Kingdoms period, both Later Yan and the Northern Wei had commanderies named Dai.

[4] It held some lands in northern Shanxi and Hebei but was mostly to their north in what is now Inner Mongolia, with their capital at Shengle (northwest of present-day Horinger).

The ruins of ancient Dai in Yu County , Hebei .
A map of Zhao ( w "Chao"), showing the town of Dai ( w "Tai") in its northeast. The commandery was organized following King Yong's military reforms and expansion into Loufan and Linhu (shown in outline to the northwest).
Commanderies of the Qin Empire, with Dai in the central north
Kingdoms and Commanderies of early Han-era China, c. 195 BC