公孫淵
The only real military gain for Cao Wei during Cao Rui's reign was the end of the Gongsun clan's hold on Liaodong (modern central and eastern Liaoning), which was started by Gongsun Du in 190. In 228, Gongsun Du's grandson Gongsun Yuan deposed his uncle Gongsun Gong in a coup and asked for an official commission from Cao Rui. Acting against Liu Ye ()'s advice to attack the Gongsuns while there was dissension within, Cao Rui instead gave Gongsun Yuan an official commission as governor of Liaodong Commandery.