First of all, Li Shimin launched the Xuanwu Gate mutiny. When the father and son began to fight, there was a tacit understanding with him. However, after the founding of People's Republic of China (PRC), Li, as the eldest son, was named Prince and King of Qin. However, he contributed a lot to the establishment of the Tang Dynasty, and his ability was better than that of Li Qiang, so he launched the Xuanwu Gate mutiny, killed it, seized the position of the prince, and finally succeeded in taking the upper position.
Second, the Xuanwu gate soldiers remonstrated and Wu Zetian abdicated. Wu Zetian was the only female emperor in the ancient history of China. She has been in office for fourteen years and is politically clear. However, in 705 AD, Wu Zetian was seriously ill, state affairs fell into the hands of Zhang Zongchang, and Zhang Zongchang and Zhang Yizhi were in trouble. So the Prime Minister Zhang Jianzhi marched into Li Duozuo and launched the regime in the name of Zhang Zongchang's rebellion. Wu Zetian abdicated, moved to Shang Yang Palace, and passed the throne to Prince Li Xian.
Third, Li Zhongjun captured Xuanwu Gate. Li Xian is incompetent. After he came to power, the regime fell into the hands of Queen Webster and his daughter Princess Anle. In order to stay in power for a long time, they excluded Li Zhongjun, then a prince. Even conspired against Wu Sansi. In desperation, Li Zhongjun can only launch a mutiny, kill Wu Sansi, storm Xuanwu Gate, but without success, he was finally killed.
Fourth, Li Longji mutiny. After Li Zhongjun was killed, Webster's clan became more rampant, so Li Longji joined forces with Princess Taiping to launch a coup, attacked Xuanwu Gate and killed Webster's clan. Li Zhongmao abdicated, Li Dan took the upper position, and made Li Longji the prince.