《旧五代史·后梁·末帝纪上》
李保衡是杨崇本的养子，杨崇本又是李茂贞的养子，任职州二十多年，去年被他儿子杨彦鲁杀害。
保衡，杨崇本养子也。崇本乃李茂贞养子，任邠州二十余年，去岁为其子彦鲁所毒。
Li Baoheng was Yang Chongben's adopted son, and Yang Chongben was Li Maozhen's adopted son. He had been the governor for more than twenty years, and was murdered by his son Yang Yanlu last year.