陇西郡 / Longxi Commandery
陇西郡 / Longxi Commandery enters the wiki through 《资治通鉴·周纪》85｜宣太后为何私通30年后暗杀了老情人？ as one of the Qin northern frontier commanderies that become strategically meaningful after 秦国 destroys 义渠. The episode says both Longxi and the later 北地郡 came from former Yiqu territory.
Its role in the source is connective. Once Beidi is added, Longxi, Beidi, and 上郡 form a linked Qin defensive belt against northern Hu groups, turning a long-standing rear-frontier threat into administered border depth.
The page is source-scoped until additional episodes develop Longxi independently. Here it supports the 秦国后方边患管理 branch and the episode’s explanation of why eliminating Yiqu mattered to Qin’s wider expansion.