The concubine of the emperor's younger brother later became the concubine of the emperor.

It did happen in history, but the woman was not blocked.

After the Xuanwu Gate, Li Shimin put Li Yuanji's wife into the palace, but did not let her be a concubine. Concubine is the title of queen after harem. Li Shimin had this plan, but it was opposed by ministers and women, and finally failed to come true.

Because the woman's surname is Yang Xiang's concubine, unofficial history later confused the two and simply matched the size.