《资治通鉴·唐纪·唐纪三十九》
李怀光本是勃海人，姓茹，是朔方将领，因功而被赐姓为李。
怀光，本勃海靺鞨也，姓茹，为朔方将，以功赐姓。
Li Huaiguang was originally from Bohai and had the surname Ru. He was a general in the Shuofang Circuit who had his surname changed to Li for meritorious service.