In the nine years of Tang Gaozu's martial arts (626), Li Shimin, who was then King of Qin, launched a coup in Xuanwumen, killing his eldest prince Li Jiancheng and his fourth brother Qi Wang Li Yuanji, becoming the new heir to the throne.
Later generations were very tolerant of Li Shimin's uncle's behavior of forcing his father. One of the main reasons is that Li Jiancheng and Li Yuanji also hurt Li Shimin, and the other is that during the establishment of the Tang Dynasty, Li Shimin's credit was even greater than Li Yuan is much bigger.
In the last years of the Sui Dynasty, there was a tendency for chaos in the world, and it was Li Shimin who persuaded Li Yuan to start troubles many times before the establishment of the Jinyang regime and the Li Tang regime.
In order to unify the whole country, Li Shimin led his army to the North to fight the North. It can be said that half of the Great Tang Dynasty was hit by Li Shimin.
However, after the reunification of the Tang dynasty, Li Yuan sealed the older Li Jian as the prince in accordance with the eldest son inheritance system. This, of course, made Li Shimin dissatisfied. He also launched a mutiny for his own grievances.
We said that half of the Great Wall is due to Li Shimin, and the other half is due to his sister.
This sister of Li Shimin is the third daughter of Li Yuan, also known as Princess Pingyang Zhao. Her record in life is second only to Li Shimin.
The exact name and date of birth of Princess Pingyang Zhao are not recorded in the history books. But we can know that when she was young, Li Yuan was married to Chai Shao, who had an extraordinary skill and loved to martial arts.