Unchu County

…It has been a base for the nomadic tribes of the north since ancient times. During the Tang Dynasty, it was called Yunzhong County and was originally the administrative center of Yunzhou or Yunzhong County. During the Liao Dynasty, Datong County was established and the administrative area centered on Datong Prefecture came to be called Datong Prefecture. In the past, Yunzhong referred to the western part of the Zhao Dynasty during the Warring States period, and was a wide area south of the Yinshan Mountains. …

*Some of the terminology that refers to "Unzhong County" is listed below.

Source | Heibonsha World Encyclopedia 2nd Edition | Information

…古来，北方の遊牧民族に対する拠点であった。唐代ここを雲中県と称し，雲州あるいは雲中郡の行政中心としたのが始まりで，遼代には大同県がおかれ，これを中心とした行政区域を大同府というようになった。古く雲中というのは，戦国時代の趙国の西部をさし，陰山山脈南方の広い地域であった。…

※「雲中郡」について言及している用語解説の一部を掲載しています。

出典｜株式会社平凡社世界大百科事典 第２版について | 情報