《资治通鉴·唐纪·唐纪六十五》
三月，唐朝廷将河东所辖云州、蔚州、朔州三州之地割归大同军领辖。
三月，割河东云、蔚、朔三州隶大同军。
In March, the Tang Dynasty will transfer the three prefectures of Yunzhou, Wuzhou, and Shuozhou under the jurisdiction of Hedong to the jurisdiction of Datong Army.