甘泉宫 / Ganquan Palace
甘泉宫 / Ganquan Palace appears in 《资治通鉴·周纪》85｜宣太后为何私通30年后暗杀了老情人？ as the palace where 芈八子 / 宣太后 lures and kills the 义渠 king. The source treats the location as the hinge between a decades-long intimate relationship and Qin’s immediate military absorption of Yiqu.
The palace matters because the episode reads the killing as a low-cost way for 秦国 to decapitate a frontier polity before invasion. Ganquan Palace therefore belongs to 亲密关系式边患安抚 and 秦国后方边患管理 rather than to a standalone architectural story.