Tang Wenzong Li Ang, formerly known as Haan Lee, is the second son of Tang Muzong. After Tang Jingzong's death, with the support of eunuch clique, Tang Wenzong succeeded to the throne and reached the peak of power in the Tang Dynasty. After Tang Wenzong ascended the throne, he wanted to revive the Tang Dynasty. However, the Tang Dynasty accumulated too many evils, and the domestic situation was decadent, with internal and external troubles. Among them, eunuchs intervened in politics in the Tang Dynasty, and the dispute among cronies was particularly serious. Tang Wenzong decided to clear the monarch's side first, and then treat foreign invasion.
In this context, Tang Wenzong promoted Li Xun to be the prime minister. With his help, he first used the contradictions and conflicts between eunuchs to design the relationship between eunuchs and killed the great eunuch Wang Shoucheng. Then, in the late autumn of 835, Tang Wenzong's joint prime minister and a group of officials loyal to the royal family lied that there was nectar on pomegranate, lured another eunuch, Chou Shiliang, to enjoy it and beheaded him.
However, the wily Chou Shiliang found that John, who lied about dew, had changed color and sweated, and saw many soldiers holding weapons. He felt bad and ran straight back to the palace. Back to the palace, Chou Shiliang directly controlled Tang Wenzong in his hands. At this time, Li Xun also wanted to take back the emperor, but there was nothing he could do. Therefore, Chou Shiliang ordered the closure of the city gate and slaughtered officials with his Ce Shen army, which was called "the change of Mana" in history.