《旧唐书·列传·卷七十一》
皇帝将要再在原州筑城，就任命李怀光兼任泾州刺史，泾原、四镇、北庭节度使。
上将复城原州，乃以怀光兼泾州刺史、泾原四镇北庭节度使。
The emperor will build a new city in the original state, appoints Li Huaiguang to be the Cihist of Zhingzhou and the Jiedushi of Jingyuan, the four towns and Beiting.