《三国志·魏书·乌丸鲜卑东夷传》
这时魏太祖曹操正扫平河北，阎柔帅鲜卑、乌丸归顺于他手下，曹操任命阎柔为校尉，还持有汉朝符节，以广宁为治所。
会太祖平河北，柔帅鲜卑、乌丸归附，遂因以柔为校尉，犹持汉使节，治广宁如旧。
At this time, Wei Taizu Cao Cao was sweeping through Hebei, and Yan Rou led the Xianbei and Wuhuan to surrender to him. Cao Cao appointed Yan Rou as a Lieutenant, who also held the Han dynasty talisman, and took Guangning as his administrative seat.