《新五代史·列传·唐明宗家人传第三》
明宗即帝位，商议立皇后，曹氏当立，曹氏对王氏说： 我多病，性情不耐烦，妹应当代替我当。 
明宗即位，议立皇后，而曹氏当立，曹氏谓王氏曰： 我素多病，而性不耐烦，妹当代我。 
When Emperor Mingzong ascended to the throne, he began to consider making Lady Cao empress. However, Cao told Wang, “I have frequent illnesses, and my disposition is not always amenable. My younger sister should take my place.”