殷晋 / Yinjin
殷晋 / Yinjin appears in 《资治通鉴·周纪》34丨秦国总理如何玩转六国 in two related roles. It is named as 犀首公孙衍’s home place in 魏国, and it is the territory Wei cedes to 秦国 when seeking peace in 332 BCE.
The page is source-scoped. Yinjin matters less as geography by itself than as a hinge between personal origin and territorial transfer: a Wei-born strategist helps Qin damage the eastern alliance environment, and Wei then loses his home-region place to Qin in the same episode’s pressure sequence.