《周书·本纪·卷一》
后代有个叫葛乌菟的人，雄武多谋略，鲜卑人敬慕他，拥戴他为主子，就此总统十二部落，世代为大人。
有葛乌菟者，雄武多算略，鲜卑慕之，奉以为主，遂总十二部落，世为大人。
In later generations, there was a man named Ge Wutu who was brave and resourceful. The Xianbei people admired him and respected him as the master. Thus, he led the twelve tribes and became adults from generation to generation.