《新唐书·列传·卷一百三十九》
大历年中，李灵耀占据汴州叛变，刘玄佐乘其不备，偷袭占领了宋州，朝廷下诏以宋州隶属刘玄佐管辖，节度使李勉上表奏请让刘玄佐代理宋州刺史。
大历中，李灵耀据汴州反，玄佐乘其无备，袭取宋州，有诏以州遂隶其军，节度使李勉即表署刺史。
During the Dali years, Li Lingyao occupied Bianzhou and rebelled. Liu Xuansuo caught him off guard and stealthily attacked and occupied Songzhou. The imperial court issued an edict subjecting Songzhou to the jurisdiction of Liu Xuansuo and governor Li Mian presented a statement to the emperor, requesting that Liu Xuansuo be appointed the Acting Governor of Songzhou.