《旧五代史·其它·外国列传一》
正逢契丹回图使乔荣要回北方去，晋朝侍卫亲军都指挥使景延广对乔荣说 ：晋朝先帝是契丹所立，新帝是中原自己册封，对契丹称孙就可以了，称臣则不可。
会契丹回图使乔荣北归，侍卫亲军都指挥使景延广谓荣曰： 先朝是契丹所立，嗣君乃中国自册，称孙可矣，称臣未可。
It was time for Qidan's envoy Qiao Rong to return north. Jing Yanguang, the Commander of the Imperial Guard of Jin, said to Qiao Rong, "The late emperor of Jin was established by Qidan. The new emperor was established by the Central Plains. It is fine to address Qidan as a grandson, but it's unacceptable to address him as the emperor."