Established by Shi Huangdi, it originally covered the entire territory of the Qin Empire west of Mount Long with its capital at Didao (present-day Taoyang in Lintao County).
Qin Dynasty, the ruling dynasty in China between 221 and 206 BC
Under the Qin Empire, the area was part of Longxi Commandery but the Emperor Wu of the Han separated the region as the Tianshui Commandery as part of his expansion towards the Tarim Basin.
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In his Records of the Grand Historian, Sima Qian claimed the Qin Empire had spread so far as Rinan, where the houses faced north instead of south.