义渠 / Yiqu
义渠 / Yiqu appears in 《资治通鉴·周纪》35丨历史上第一骑兵教父是他？ as a powerful western neighbor in 秦国’s rear. The episode says Yiqu had grown strong in the Eastern Zhou period, its ruler claimed kingly status, and it learned from the central states by building cities and settling more permanently.
The source treats Yiqu as a structural pressure point for Qin rather than a one-episode enemy. Because Qin’s main strategic attention is still directed eastward against 魏国 and the Hexi frontier, Qin has reason to avoid a full two-front conflict when possible. Its partial victory in Zhou Xian Wang’s forty-second year occupies some Yiqu land and folds it into Qin’s county system, but Yiqu’s submission is not the same as final extinction.
Yiqu therefore supports Qin frontier buffer management in the wiki: a strong rear frontier can be temporarily soothed, punished, or partially absorbed, but it remains a live constraint on eastward strategy.