Princess Qi was born in the imperial clan of Sui Dynasty, and Yang was born in a noble family. At the beginning, Li Yuan attached great importance to Yang's family and hired him as the beloved son of Princess Li Yuanji. In the last years of Wude, the struggle between Qin Wang, Prince Li and Qi Wang Li Yuanji entered a white-hot stage. Li Shimin abandoned the ancient strategy of seizing power and accepted violence. He burned his bridges in the ambush at Xuanwu Gate and killed his younger brother Li himself. His brother Li Yuanji was also killed in the battle. Tang Gaozu's Li Yuan was forced to abdicate, and the Li Shimin faction won the final victory.

Li Yuan, the founder of the Tang Dynasty, was also a prolific father. His sons gave birth to 22 children, of which three are the most famous, the eldest son Li (Prince), the second son Qin (King of Qin) and the fourth son Li Yuanji (King of Qi). These three brothers are all born to Queen Dou, and they are half-brothers. As a result, both Li and Li Yuanji were shot in Xuanwu Gate in 626. After Li and Li Yuanji died, most of their families were also killed.

Li Shimin got rid of Li Yuanji and brought his wife into the harem. Teenagers had married Li Yuanji, but also for the sake of political marriage. At that time, Yang Jiajiang put money on Li, hoping to support Li's succession with the help of Li and Li Yuanji, so as to continue the prosperity of the Yang family. Unfortunately, they bet the wrong money, and finally Li Shimin won. The change of Xuanwu Gate is an important historical event in the Tang Dynasty. In this coup, Li Shimin killed his brother and successfully seized the military power.

After that, Li Yuanji and Liu Yuanji's sons were dealt with, but only his wife Yang was spared and even brought into the harem. To tell the truth, this is indeed immoral. Therefore, Yang and Li Yuanji have no feelings, and her role in it is mainly to help the family stabilize their position and help the prince ascend to the throne. So why is Yang willing to enter the palace? Because she doesn't have to fight back. She has no feelings for Li Yuanji, so it doesn't matter if she marries Li Shimin again. The most important thing is to ensure the interests of the family. However, in those days, there were actually many people who couldn't help themselves. As a woman, Yang bears too much, but she really does well. If it is someone else, it may not have her tenacity and boldness.

Li Shimin brought Li Yuanji's wife into the harem? Not for enjoyment, but for great wisdom. Just look at Yang's background. It is also because of his power and power that Li Shimin attracted the fear of his father and the rejection of his eldest brother Li Chengjian and his younger brother Li Yuanji. After escaping their murders many times, Li Shimin led a group of men to launch the famous "Xuanwumen Rebellion" in history. Lee and Li Yuanji were killed and forced to abdicate. Li Shimin became the new monarch of Emperor Taizong.