《资治通鉴·汉纪·汉纪三十六》
夏季，南单于所俘虏的北匈奴左贤王带领旧部及南匈奴的五位骨都侯，共计三万多人，叛变北逃，在距北匈奴王庭三百余里处，自立为单于。
夏，南单于所获北虏薁建左贤王，将其众及南部五骨都侯合三万馀人畔归，去北庭三百馀里，自立为单于。
In the summer, the Left Worthy King of the Northern Huns, who was captured by the Southern Chanyu, led his old subordinates and five bone lords of the Southern Huns, totally more than 30,000 people, betrayed them and fled north, establishing himself as Chanyu 300 miles from the royal court of the Northern Huns.