Gongsun Kang
Gongsun Du was appointed Administrator of Liaodong Commandery by Dong Zhuo in 189 on the recommendation of Xu Rong. As a result of his lowly origins, Du harbored an intense hatred for the elite landowning class. Once he became administrator, Du carried out his vendetta against the wealthy by publicly flogging to death the Magistrate of Xiangping and extirpating the gentry. Du dominated the northeast and expanded into the territory of Goguryeo and the Wuhuan. When Cao Cao attempted to bestow titles upon Du, he rejected them and proclaimed himself king. Du died in 204 and was succeeded by his son, Gongsun Kang. In 204 Kang expanded into Goguryeo and created Daifang Commandery. When the Wuhuan were defeated by Cao Cao in 207, Yuan Shang, Yuan Xi, and the Wuhuan leaders Louban and Supuyan fled to Kang. Kang killed them and sent their heads to Cao Cao. In 208, Kang sent aid to Balgi in support of his claim to the Goguryeo throne, but was defeated by Gyesu, younger brother of Sansang of Goguryeo. However in 209 Kang invaded Goguryeo again, took its capital and forced them to submit. Goguryeo was forced to move its capital further east. Kang died in 220 when his children were too young to rule, so his brother Gongsun Gong succeeded him. Gong maintained his independence, albeit while accepting titles issued by Cao Pi. Gong became ill and was replaced by his nephew Gongsun Yuan in 228. Yuan ruled independently until Sima Yi invaded in 238 and annexed his territory.