《旧唐书·本纪·卷十五》
十月十九日，任命神策军普润镇使苏光荣为泾州刺史、四镇北庭行军泾原节度使。
戊戌，以神策普润镇使苏光荣为泾州刺史、四镇北庭行军泾原节度使。
On October 19, Su Guangrong, the magistrate of Shence Military's Putiao Town, was appointed as the Prefect of Jingzhou and the Jiedushi of Jingyuan for the four towns of Beiting Military.