Liqian () was a county established during the Western Han dynasty and located in the south of modern Yongchang County, Jinchang, in Gansu province of Northwest China. The Western Han inhabitants of the county had migrated to the area from western regions. The county was renamed Liqian (力乾) during the Northern Wei dynasty and disestablished during the Sui dynasty, becoming part of Fanhe County.
In 37 BC, General Chen Tang () of the Western Han dynasty attacked Xiongnu and brought many captives back to China in 36 BC. These captives were given land to be settled. The place was called Liqian, which is where Zhelaizhai is now situated. It is believed that the name Liqian may have some etymological relationship to Rome or the Ptolemy's of Egypt.
Liqian was split from Fanhe and received the county status in the Western Han dynasty. The inhabitants around Liqian were later called Liqian Rong () or Lushui Hu () in historical records. Several states established by non-Han Chinese have controlled Liqian during the Sixteen Kingdoms period. Lushui Hu even ruled one of these states, the Northern Liang, from 401 to 439 AD.
The Northern Wei conquered the Northern Liang. In the coming years, Liqian was ruled by the Northern Wei, the Western Wei, the Northern Zhou, and then the Sui dynasty dynasty, which reunified China in 589 AD. Liqian county was merged into Fanhe county again in about 592.
Several investigations of Dubs' theory have been conducted. To date, no artifacts which might confirm a Roman presence, such as coins or weaponry, have been discovered in Zhelaizhai. Rob Gifford, commenting on the theory, described it as one of many "rural myths".
A DNA study found that "paternal genetic variation" did not support "a Roman mercenary origin" and that the modern population of Liqian was consistent genetically with being a "subgroup of the Chinese majority Han Chinese."
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