Changes of Xuanwu Gate

The change of Xuanwumen was a bloody coup staged by Li Shimin, then General Ce Tian and the second son of Tang Gaozu's second son Li Yuan, on the 4th day of Gengshen (July 2nd, AD 626) in Wude, Tang Gaozu, near Xuanwumen, the northern palace gate of the Imperial Palace in Chang 'an (now Xi City, Shaanxi Province). As a result, he killed his eldest brother, Crown Prince Li and his third brother (it turned out to be the fourth brother, because Li Xuanba, the third son of Li Yuan, died young). Both Li's son and Li Yuanji were executed. Wang Fuzhi's History as a Mirror: "Since Emperor Taizong's reign of Emperor Gaozong, the rebels have been trapped in the elbow armpit. Since the beginning of Kaiyuan for more than 20 years, the day has been chaotic." Since Li Er, this prince has not been human, such as Li Chenggan, Li Hong, Li Xian, Li Zhongrun, Li Zhongjun and Li Ying. . . . . . . . .

Li Shimin is ruthless and thick-skinned, but he likes to whitewash himself. But after that, the emperor did a good job, and there was also an element of excessive boasting by later generations.

Li's civil and military skills are not necessarily worse than Li Er's.

Li Yuanji is a little behind his two brothers.