《新五代史·列传·杂传第四十二》
唐庄宗消灭梁，李愚到京师朝拜，唐的公卿士大夫素来知道李愚学古，很看重他，拜为主客郎中、翰林学士。
唐庄宗灭梁，愚朝京师，唐诸公卿素闻愚学古，重之，拜主客郎中、翰林学士。
After Tang Zhuangzong destroyed Liang, Li Yu went to the capital to pay homage. Tang's civil and military officials and scholars had always known that Li Yu studied the ancients and valued him very much. He was appointed as the Chief of Guests and Hanlin Academician.