Why did Emperor Xuanzong kill his aunt Princess Taiping?

First of all, because Princess Taiping blocked the way of Emperor Xuanzong of the Tang Dynasty, Princess Taiping became domineering because of Wu Zetian's love, and her power in the DPRK was also great. Tang Xuanzong was constrained by Princess Taiping and had to intervene in many political affairs, which made Tang Xuanzong very unhappy. When she became emperor, she was influenced by a woman. So Tang Xuanzong had enough of Princess Taiping and killed her.

Another reason is that Wu Zetian is the only female emperor in history and Princess Taiping is the daughter of Wu Zetian. Emperor Xuanzong of the Tang Dynasty was afraid that Princess Taiping would become the next Wu Zetian and that the world would be ruled by another woman, so he had to kill Princess Taiping. In addition, Princess Taiping's usual behavior style is very similar to that of Wu Zetian. The greater the power of Princess Taiping, the more afraid Tang Xuanzong was. Only when Princess Taiping dies can he feel at ease.

The kinship of the royal family is not much better than that of ordinary families. People in the royal family are already very cold, and there are records in history that many people kill each other with their brothers and sisters for the throne. Although Princess Taiping was the aunt of Emperor Xuanzong of Tang Dynasty, she was a stumbling block in the eyes of Emperor Xuanzong of Tang Dynasty. For the sake of her own throne and the Tang Dynasty, and for the sake that the world can no longer fall into the hands of women, Princess Taiping will die.

Moreover, Princess Taiping has the intention of rebellion, because Wu Zetian's blood is flowing in her body. She thinks that her mother is very powerful and can be a female emperor, so Princess Taiping thinks that she should be as powerful as Wu Zetian and be a female emperor in history. However, because of the lessons of Wu Zetian, Emperor Xuanzong of the Tang Dynasty was also very wary of Princess Taiping, and finally did not let Princess Taiping succeed and killed her.