In 220 (the first year of the Huang Dynasty), Cao Cao died, his son Cao Pi became emperor, and Gongsun Kang submitted to Wei. In 221, Gongsun Kang died, and his brother Gongsun Gong (公孙恭嗣) was made the Taishou of Liaodong Commandery (辽東郡太守). Emperor Wen of Cao Pi made Gong a che general and made him marquis of Guo. In 228 (the second year of Taihe), Gongsun Yuan robbed his uncle Gongsun Gong of the throne, and the Wei Ming Emperor Cao Rui made him a general of Yang Lie and led Liaodong Taishou. In 232 (the sixth year of Taihe), Gongsun Yuan decided to go to Wu to reject Wei and declared himself a vassal of Eastern Wu. Sun Quan was enfeoffed as the King of Yan in 233, and 170 counties in 17 counties of Youzhou and Qingzhou belonged to Gongsun Yuan. In 233 (the first year of the Qinglong Dynasty), Gongsun Yuan abandoned Wu and Wei, beheaded Zhang Mi and Xu Yan, eastern Wu's envoys stationed in Xiangping, and sent the head to Luoyang. Cao Rui sent an envoy to Xiangping, and made Gongsun Yuan the Grand Sima and the Duke of Lelang. In 237 (the first year of the Jing Dynasty), Gongsun Yuan established himself as the King of Yan and established the era name, "Widely placed hundreds of officials and divisions". Emperor Wei decided to use Sima Yi to lead an army to conquest. Gongsun Yuan learned that he would "claim to be a vassal of Eastern Wu and beg for troops to go north to save himself", but lord Wu could not come out according to the army, and Gongsun Yuan beheaded 4 envoys of Eastern Wu stationed in Xiangping, indicating that wu would not be attached to Wei. Lord Wei rebelled against Gongsun Yuan and sent Sima Yi and Wuqiu Jian to lead 40,000 troops to liaodong in 238 (the second year of the Jing dynasty). In June, the two armies fought near Shoushan, and Gongsun Yuan fortified the city. In August, heavy rains continued, the river flooded, Sima Yi's soldiers besieged the city, the city ran out of food, Gongsun Yuan begged, and Sima Yi sternly refused. On the twelfth day, Gongsun Yuan led his troops to flee southeast of The City, where he was captured and beheaded by the Wei army on the west bank of Liangshui (present-day Taizi River) (around the area of present-day Emei to DadaBaihu in the southeast of the city). The separatist regime established by the Gongsun clan in Xiangping, Liaodong Province, began in 189 when Gongsun Du served as the Taishou of Liaodong, and was passed down by the third and fourth dynasties, beginning and ending in 50 years.238 (the second year of the Jing Dynasty) The city of Xiangping fell and Sima Yi ordered a massacre. All the officials below the secretary of state in the Gongsun regime were exterminated, killing more than 7,000 men over the age of 15 and more than 2,000 generals in the army. In the same year, around 238 and 240, a large number of people in Liaodong and Xiangping fled to western Liaoning and Hebei, and some fled across the sea to the Shandong Peninsula. In the same year, Wei destroyed the Gongsun clan regime, and the two counties of Liaodong and Xuanyu were incorporated into the territory of the State of Wei; the counties of Shulelang and Daifang were established in the area controlled by the former Gongsun clan, such as Pingzhou (平州, in present-day Liaoyang, and later moved to XiangpingCheng), with jurisdiction over 5 counties including Liaodong and Other Prefectures, and the Lieutenant Yu Xiang of Dongyi was placed under the command of Xiang. Liaodong County administers 7 counties, with Xiangping as the first county. Subsequently, Pingzhou was merged into 5 counties including Youzhou and Liaodong and its subordinate counties under the jurisdiction of Youzhou.
