Gongsun Kang
Gongsun Yuan was a son of Gongsun Kang, a warlord who controlled Liaodong, Xuantu, Lelang and Daifang commanderies in the late Eastern Han dynasty. He became a vassal of the state of Cao Wei during the Three Kingdoms period. When Gongsun Kang died, his sons Gongsun Huang and Gongsun Yuan were still too young at the time to succeed him, so his younger brother Gongsun Gong took over. In 228, a grown-up Gongsun Yuan seized power from his uncle Gongsun Gong and imprisoned him.