《北史·列传·卷十一》
他常见到裴植、郭祚在身边作祟，自知必死无疑，便事先上表，请求将自己抚养的已去世的弟弟的第二个儿子、现任司徒椽于永超作为自己嫡子。灵太后答应了。
见裴、郭为祟，自知必死，先表养亡弟第二子司徒掾永超为子，乞以为嫡。灵太后许之。
Yu Zhong frequently saw that Pei Zhi and Guo Zuo were doing evil by his side. He knew that he would definitely die, and he made an official request in advance to appoint Yu Yongchao, second son of the deceased younger brother that he had brought up, and now he is in charge of Situ Yuan, as his legitimate son. Empress Ling agreed.