《资治通鉴·唐纪·唐纪五十三》
成德节度使王士真去世，他的儿子副大使王承宗自命为留后。
成德节度使王士真薨，其子副大使承宗自为留后。
The Chengde Prefectural Governor Wang Shizhen died, and his son, the Deputy Governor Wang Chengzong, declared himself to be the Governor.