The Records of the Three Kingdoms records that the Yilou were located more than a thousand li north of Buyeo in forests covering mountainous terrain that had formerly been the kingdom of the Sushen clan. The text reports that, although the Yilou were subjects of Buyeo, they did not speak the same language as the people of Buyeo and Goryeo.
The Records of the Three Kingdoms document that the Yilou were positioned more than a thousand li north of Buyeo in forested mountainous regions that had been inhabited by the Sushen clan. The text notes that, even though they were subjects of Buyeo, the Yilou did not share the same language with those of both Buyeo and Goryeo.