《新唐书·列传·卷一百三十七》
仆固怀恩上表推荐李怀仙任幽州卢龙节度使，后升检校兵部尚书，封爵武威郡王。
仆固怀恩即表怀仙为幽州卢龙节度使，迁检校兵部尚书，王武威郡。
Puguhuaien recommended Lihuaixian to be the Jiedushi of Youzhou Lulong in a memorial, and later promoted to be a Jianxiaobingbu Shangshu, and enfeoffed as the King of Wuwai County.