Is there a storyline in Empresses in the Palace in history?

This highly acclaimed Gong Dou novel cannot be separated from so many historical allusions. Although the novel is fictional, some things did happen in history.

Mog Khan brought a big black bear to Beijing for the emperor to enjoy. But the black bear jumped out of the cage and ran around, and the left and right concubines were busy running for their lives. Only Xu stood before the emperor, and finally the guards came to catch the black bear. Later, after being moved by the emperor, Xu was made a filial wife. This story comes from the Han and Yuan Dynasties, and Feng Jieyu is a bear. In the play, An Lingrong was called a swallow on the ice by the queen. In the play, An Lingrong is good at singing and dancing. Although she loves deeply, she can't get pregnant. Historically, Ye Zhao was unable to get pregnant.

Zhen returned to the palace after leaving the palace and was named a princess. This is very similar to Wu Zetian's return to the palace. They all met the emperor in the temple, rekindled their old feelings and entered the palace gate. For example, Zhen _ finally decided to abort the child and bring down the queen. After the incident, the queen told the emperor that the situation of male and female servants was the same as that of the queen. The emperor said that I was not Tang Gaozong and would not be easily deceived. They said that Wu Zetian strangled her daughter and framed her as the queen.