公孫康
Liaodong Commandery of You Province, part of present-day Manchuria, was situated at the northeastern fringe of Eastern Han China, surrounded by the Wuhuan and Xianbei nomads in the north and Goguryeo and Buyeo peoples in the east. In the autumn of 189, Gongsun Du, a native of Liaodong, was appointed as the Administrator of Liaodong (), and thus began the Gongsun family's rule in the region. Taking advantage of his distance from central China, Gongsun Du stayed away from the chaos which accompanied the effective end of Han rule, expanded his territories to include the commanderies of Lelang and Xuantu, and eventually proclaimed himself as Marquis of Liaodong (). His son Gongsun Kang, who succeeded him in 204, created the Daifang Commandery and maintained the autonomy of Liaodong by aligning himself with the warlord Cao Cao. Gongsun Kang died some time around the abdication of Emperor Xian of Han to Cao Pi, son of Cao Cao, and Gongsun Kang's brother Gongsun Gong became the new ruler of Liaodong. Gongsun Gong was described as incompetent and inept, and he was soon overthrown and imprisoned by Gongsun Kang's second son Gongsun Yuan in 228.