《资治通鉴·晋纪·晋纪三十三》
他曾经与郭、以及异父同母兄弟郭煌人宋繇住在一起，郭起身对宋繇说： 你将来一定官至极品，你的哥哥李君最终一定会拥有一个国家。母马生下白额毛的小马驹，就是你们出人头地的时候。 
尝与郭黁及同母弟敦煌宋繇同宿，黁起谓繇曰： 君当位极人臣，李君终当有国家；有骒马生白额驹。此其时也。 
Once, when he was staying with his stepbrother Guo and his paternal half-brother Song Yao, Guo stood up and said to Song Yao: In the future, you will certainly hold the highest official rank, and your elder brother Li Jun will eventually have a country of his own. When a mare gives birth to a white-foreheaded colt, that will be the time when you two will achieve great things.