Zhou Huaizheng
Zhou Huaizheng was a powerful Song dynasty palace eunuch during Emperor Zhenzong's reign. After Emperor Zhenzong's illness in 1019 made him incapable of ruling, state power gradually fell to the hands of his wife Empress Liu and chancellor Ding Wei. Zhou plotted to assassinate Ding so that Kou Zhun could return to chancellorship, but his coup failed. He was arrested by Lei Yungong and executed.