《旧唐书·本纪·卷十八》
银青光禄大夫、检校尚书左仆射、兼太子太保、充任右羽林统军、御史大夫、上柱国、荥阳县开国男、食邑三百户郑光去世，皇上停止上朝三天，赠郑光司徒衔，并命令百官奉圣旨抚慰，郑光是皇上的大舅。
银青光禄大夫、检校尚书左仆射、兼太子太保、充右羽林统军、御史大夫、上柱国、荥阳县开国男、食邑三百户郑光卒，辍朝三日，赠司徒，仍令百官奉慰。上之元舅也。
Yinqing Guanglu Grand Master, Examiner and Assistant Minister of the Left, Concurrently-Held Imperial Tutor, Commander of the Right Imperial Guards, Censor Minister, Duke of the State, and Heir to Yingyang County, given an income of 300 households, Zheng Guan dies. The Emperor suspends court for three days, and gives Zheng Guan the posthumous title of Minister of the Masses. He also sends all officials to offer their condolences, as Zheng Guan was the Emperor's Maternal Uncle.