《旧五代史·后晋·列传十三》
到高祖登上帝位，让他担任成德军节度使，接连升至使相。
及即位，授成德军节度使，累加至使相。
When the Senior Emperor ascended the throne, he let him serve as Jiedushi of Chengde Military District and promoted him successively to lead minister.