《新五代史·列传·杂传第二十七》
命令燕人用泥土做钱，把铜钱全部收敛起来，挖山洞藏起来，不久又杀掉工匠灭口，后人都不知道藏钱的地方。
令燕人用墐土为钱，悉敛铜钱，銮山而藏之，已而杀其工以灭口，后人皆莫知其处。
He ordered the Yan people to make mud coins, and collected all the copper coins, hiding them in a cave that he dug in a mountain. Soon after, he killed the craftsmen to silence them, and the hiding place of the money became a mystery.