Gao Gan
In 205, Gao Gan, a northern warlord and adopted nephew of Yuan Shao, rebelled against Cao Cao, to whom he had surrendered years earlier. Gao Gan convinced Wang Yi (), the Administrator of Hedong Commandery (), to join him in the rebellion. Two other men from Hedong Commandery, Wei Gu () and Fan Xian (), claimed to have liberated cities for Cao Cao, while conspiring with Gao Gan.