After careful consideration, Li Chengyin's historical prototype was finally determined as Emperor Taizong, and there was also an Anxi capital protection mansion in the play, which was established in the border areas by the border dynasties to maintain peace among countries in the western regions. This Anxi single-family mansion did exist in history, and it happened to exist in the Tang Dynasty. The reigning royal family happens to be Li, and the family is also the royal family, also surnamed Li. From Anxi Duhufu to Li's royal family, these are clues to prove the background of the East Palace. It is not difficult to find the prototype of Li Chengyin in Tang Dynasty. However, after a bloody battle, Li Chengyin stepped onto the Eastern Palace step by step, and finally sat on the throne, which was particularly highly compatible with Li Shimin who initiated the "Xuanwu Change".

Li, a character in the TV series East Palace, is played by.