《魏书·列传·卷二十一》
起初，公孙表与勃海封恺友好，后来为儿子求娶封恺的侄女，封恺不答应，公孙表非常恨他。
初，表与勃海封恺友善，后为子求恺从女，恺不许，表甚衔之。
Initially, Gongsun Biao and Bohai Feng Kai were friendly. Later, he betrothed his son to Feng Kai's niece, but Feng Kai refused, so Gongsun Biao hated him very much.