What were the four counties in Hexi in Han Dynasty?

The four counties in Hexi in Han Dynasty were Jiuquan, Wuwei, Dunhuang and Zhangye.

In the Han Dynasty, a large agricultural area was established in the north of the Great Wall, which was cultivated by settlers. In BC 12 1 year, Xie Kun, king of Xiongnu living in Hexi area, and King Xiutu surrendered to the Han Dynasty. In the Han Dynasty, Kun Xie was named as the source of Yin Hou, and four of his subordinates were named as Liehou. More than 40,000 people of its Ministry were placed in Longxi, Beidi, Shang Jun, Shuofang and Yun Yun, which are collectively called five subordinate countries. Subsequently, the Han Dynasty established Jiuquan, Wuwei, Dunhuang and Zhangye counties in Hexi in the original nomadic areas of King Xie Kun and King Xiu Tu.

According to History of Han Geography, in BC 104, the Western Han government established Jiuquan County and Zhangye County, in1kloc-0/year, Wuwei County, and in 88, Dunhuang County. According to the historical records of Emperor Wu of the Han Dynasty, in the second year of Yuanshou (before 12 1), the evil king fell, and his place was Wuwei and Jiuquan County. Ding Yuan for six years (former 1 1 1) was divided into Zhangye and Dunhuang counties. It is more reliable to refer to relevant historical materials.