《资治通鉴·唐纪·唐纪五十七》
朝廷商议发兵讨伐王弁，但又恐怕青州和郓州相互煽动，继而也发生兵变。于是，任命王弁为开州刺史，派宦官把任命书授予王弁。
朝廷议兴兵讨王弁，恐青、郓相扇继变，乃除弁开州刺史，遣中使赐以告身。
The imperial court discussed sending troops to attack Wang Bian, but they were also afraid that Qingzhou and Yizhou would incite each other and cause a rebellion. So, they appointed Wang Bian as the governor of Kaizhou and sent a eunuch to grant the letter of appointment to Wang Bian.