《旧唐书·列传·卷四》
王世充又派人对杨侗说 ：现在国内还没有平定，必须有个年长的君主，等到天下太平无事了，恢复您这圣明的皇上。
世充又使人谓曰： 今海内未定，须得长君，待四方乂安，复子明辟。
Wang Shichong again sent someone to tell Yang Dong: The country has not yet been pacified, there must be an older monarch, and when the world is peaceful, you will be restored as the holy emperor.