《水经注·卷八》
汉高帝十二年把这地方封给他的大舅宋俊，立为侯国。
孝安帝以建光元年封元舅宋俊为侯国。
In the 12th year of the reign of Emperor Gao of the Han Dynasty, this place was conferred to his maternal uncle Song Jun and established as a marquisate.