After the Emperor’s death that year Wu Chao joined her sister concubines in the nunnery. A year later Kao Tsung, now Emperor, visited the temple to make sacrifice-burnt offerings-to his father’s spirit. By intent or by accidents, he saw Wu Chao again, and the pair discovered that their attraction for one another had not subsided. It so happened that Kao Tsung’s Empress Wang, had no son, but his favorite concubine did have one, Understandable rivalry existed between the two women. The Empress, aware of her husband’s infatuation for Wu Chao (ironically as it burned out), urged him to have her released she thought to use her against Pure Concubine (the favorite), whom she saw as the greatest threat to her position. So Wu Chao returned to the palace, this time as Concubine of the second Grade; within a few years, her name become associated with intrigues and scandals. Her promotion and security within the imperial household, she understood, depended upon her having a son, thus giving her an advantage over the Empress who remained without male issue. Two years later Wu Chao gave birth to a son, Li Hung and the fallowing year to a daughter. On this occasion the Empress Wang visited her; after she left, attendants found the infant smothered to death. There is some disagreement as to what actually happened: the usual account is that Wu killed her child and then proceeded to accuse the Empress of the deed by sorcery. On the other hand, it is possible that the baby’s death was a natural one. The Empress, already in disfavor for not having produced a son, had shown her jealousy of Pure Concubine, and now she saw Wu Chao threatening her position. But it would hardly have helped her situation to kill Kao Tsung’s child, especially a girl baby. Nor does it seem that Wu, already in the desired position of being the mother of a son, would commit such a crime. It is evident, however, that she saw in the effort to oust Wu Chao and regain the favor of her husband. When sorcery, a heinous crime, involved the imperial household, the seriousness of the act increased enormously. The Empress and Pure Concubine, now her accomplice, were accused of attempting to poison the Emperor their imprisonment followed.