《旧唐书·列传·卷五十六》
国忠顾忌王鉷与自己平分权势，恰巧邢纟宰的事情暴露，于是陷害王鉷兄弟并杀了他们，趁此取代鉷任御史大夫，暂代京兆尹，赐名国忠。
国忠忌其与己分权，会邢縡事泄，乃陷鉷兄弟诛之，因代鉷为御史大夫，权京兆尹，赐名国忠。
Guo Zhong was afraid that Wang Jun would share power with him. When Xing Xiuzai's case was exposed, he seized the opportunity to frame and kill Wang Jun and his brothers. He thus took Wang Jun's position as the imperial examiner and became acting magistrate of the capital. He was given the name Guo Zhong.