《资治通鉴·唐纪·唐纪五十六》
沧州刺史李宗与横海节度使郑权不和，不肯接受郑权的调度管束，郑权奏报了李宗的情况。
沧州刺史李宗奭与横海节度使郑权不叶，不受其节制，权奏之。
Li Zong, the governor of Cangzhou, was at odds with Zheng Quan, the governor of Henghai, and refused to accept Zheng Quan's dispatch and control. Zheng Quan reported Li Zong's situation.