《旧唐书·本纪·卷二十》
十月初九，起居郎苏楷驳斥昭宗的谥号说 ：帝王统治天下，由治乱而察知盛衰以祭祀来配享皇天，借助谥号以定褒贬。
甲午，起居郎苏楷驳昭宗谥号曰： 帝王御宇，由理乱以审污隆；宗祀配天，资谥号以定升降。
On the 19th day of the 10th month, the official in attendance, Su Kai, refuted the posthumous title given to Emperor Zhaozong, saying: The emperor rules the world, by good governance and chaos, prosperity and decline can be used to decide the offerings to the emperor of heaven, the posthumous title is used to determine praise or blame.