衛瓘
You remained an important prefecture on the northern frontier. In AD 270, the imperial court appointed Wei Guan as the governor of the prefecture. Wei Guan was succeeded by Tang Bin (appointed 282) and Zhang Hua (appointed 291). By the time of the Rebellion of the Eight Princes, You Prefecture was controlled by Wang Jun, who secured alliances with nomadic tribes north of it by arranging marriages of his daughters to tribal chieftains of the Xianbei and Wuhuan.