《旧唐书·列传·卷四》
王世充就派遣他哥哥的儿子王琬和内史令长孙安世回访，请求出兵援助。
世充乃遣其兄子琬及内史令长孙安世报聘，且乞师。
Wang Shichong then dispatched his elder brother's son, Wang Wan, and the Chief of Internal Affairs, Zhangsun Anshi, to pay a return visit, requesting that he send troops to provide assistance.