Chen Gong
In 194, when Cao Cao left Yan Province to attack Xu Province, Zhang Miao's younger brother Zhang Chao (張超), along with Cao's subordinates Chen Gong, Xu Si (許汜) and Wang Kai (王楷), started a rebellion. Chen Gong persuaded Zhang Miao to join them in welcoming Lü Bu into Yan Province. With help from the defectors, Lü Bu seized control of Puyang and declared himself the Governor (牧) of Yan Province. The various commanderies and counties in Yan Province responded to Lü Bu's call and defected to his side, except for Juancheng, Dong'e and Fan counties, which still remained under Cao Cao's control.