《新唐书·列传·卷四十二》
高宗去东都，留皇太子哲守京师，派裴炎辅护。
高宗幸东都，留皇太子京师，以炎调护。
Emperor Gaozong left for the Eastern capital, leaving his son Crown Prince Zhi to stay and protect the main capital, and appointed Pei Yan to assist him.