《新五代史·列传·杂传第三十七》
周太祖登位后，每每叫常思为常叔，拜见他的妻子，礼节如同自家人一样。
周太祖已即位，每呼思为常叔，拜其妻，如家人礼。
After the progenitor of the Zhou dynasty ascended to the throne, he always called Chang Si "Uncle Chang," and when he met Chang Si's wife, he showed respect as if she was a member of his own family.