In the Tang Dynasty of 7 10, Wei Hou's party was destroyed and the five-year-old puppet emperor was abolished. The only one who is qualified to be emperor is Li Xian's younger brother Li Dan. At this time, even if Li Longji wanted to be emperor, his name was wrong, because he was Li Xian's nephew and not Li Dan's son, so the best way was for Li Dan to reign first.
After Li Dan ascended the throne for the second time, the first thing he faced was the problem of establishing a reserve army. Li Dan has five adult sons, among whom Li Xian is the eldest son, who was made a prince when Li Dan first ascended the throne. Li Longji, the third son, made a great contribution to the political revolution in the Tang Dynasty, showing his bold personality and strong political talent, so Li Dan hesitated to establish a reserve army.
Li Xian: As the eldest son, and he was once made a prince, he is a natural candidate for the prince in etiquette.
In the end, this dilemma was solved by Li Xian's resolute resignation. Li Chengqi firmly believes that the country is in troubled times and should establish a saint instead of a leader. His resignation made Li Dan determined to turn Li Longji into a prince.
He is clever enough. After all, it was an eventful year for the royal family in Li Tang at that time. Since Wu Zetian, all kinds of intrigue, the mother wins the son, and the wife takes the husband's position. Who knows if there will be rebellion in the future, and after the performance of Princess Taiping, it is estimated that Li Xian is no match. Then Li Longji will use his brother's calculation to stage a coup. It is estimated that Li Xian is not necessarily an opponent. He just voluntarily gave up his seat, making Li Longji a prince and Li Longji's calculation. Coupled with the contest between Li Longji and Princess Taiping, it also proves that Li Xian's choice is right. Princess Taiping is even more arrogant because of her achievements in Tang Long's political reform, and probably only Li Longji can deal with her. If Princess Taiping becomes the next Wei Ruyun. I'm afraid there will be no later prosperity.