Who is the "Liuwei Dihuang Pill" mentioned by historians?

The Luguang Dihuang Pill mentioned by historians is a joke of Tang Zhongzong Li Xian.

Why? If you think about it carefully, you may think that his achievements are not very outstanding. But a careful study of his family relationship reveals that his father is Tang Gaozong, his brother is Tang Ruizong, his son is Tang Shaozong, and his nephew is Tang Xuanzong Li Longji. See here, you may feel very normal, because it is a very common thing in history, but we can't forget who Tang Zhongzong's mother is, and that is the only female emperor in China history, Wu Zetian. This is why "Liuwei Dihuang Pill" became the nickname of Tang Zhongzong.