Tang Xuanzong greatly loved Consort Yang, but because of her favor to Li Linfu and Yang Guozhong, who were treacherous court officials, her love led to the An-Shi Rebellion, which lasted eight years, causing the powerful Tang Dynasty to go into decline.
In the year 907, Zhu Wen forced Emperor Li Zhu to abdicate, and he seized the throne, establishing Later Liang. The Tang Dynasty perished, lasting for 290 years.
After the Tang Dynasty was destroyed, another period of great division arrived, which was the Five Dynasties and Ten Kingdoms period, and it continued for 60 or so years before the Song Dynasty finally unified them.
After hearing about this history, Wu Zetian felt quite complicated. After hearing about this, she had wanted to kill Wei Xiang'Er and her daughters, as well as Yang Yuhuan, who had brought the downfall of this empire.