In the 17th year of Zhenguan, the East Palace. The deposed prince Li Chengqian, who failed in his rebellion, was about to be imprisoned and await death at the beginning, and then his father Li Er died of illness in Qianzhou! At this time, after merging all the memories of a person from later generations with the same pronunciation and the same name as Li Chengqian, the prince of the Tang Dynasty, Li Chengqian, never believed in fate! Father, since you think there are too many legitimate sons and it is difficult to choose, I will choose for you! On this day, there was bloodshed in the East Palace and Chang'an was horrified! Li Chengqian carried Wei Wang Li Tai in one hand and Jin Wang Li Zhi in the other, two dead heads, and broke into the Ganlu Hall of Tai Chi Palace! He threw the head at Li Shimin's feet, "Father, now your only legitimate son is me."