《资治通鉴·唐纪·唐纪四》
戊申，唐任命高开道为蔚州总管，赐他姓李，封为北平郡王。
戊申，以开道为蔚州总管，赐姓李氏，封北平郡王。
On Wushen Day, the Tang Dynasty appointed Gao Kaidao as the governor general of Yizhou, gave him the surname Li, and granted him the title of King of Beiping County.