泾阳君 / Jingyang Jun (Qin)
泾阳君 / Jingyang Jun appears in 《资治通鉴·周纪》89丨秦王竟被他怼“妈宝男”？ as one of the four Qin nobles named by 范雎 in his warning to 秦昭襄王.
The episode identifies the four nobles as close kin of the ruler and treats them collectively rather than biographically. Jingyang Jun therefore functions here as one part of 秦国四贵权力结构, the kin-and-office bloc that makes the Qin ruler appear isolated in his own court.