《资治通鉴·唐纪·唐纪三十六》
李与鲜于叔明回答说： 过去我们唐朝与其他的国家通婚，都是以宗室女为公主。
瑀与叔明对曰： 向者唐与诸国为婚，皆以宗室女为公主。
Li and Xianyu Shuming replied, “in the past, when our Tang Dynasty had intermarriages with other countries, it was always the royal women who would be the princesses.”