Li Shimin's fortune telling.

To understand this problem, we need to know what Long Mai is. The so-called "Long Mai" is a view of ancient Taoism, and ancient metaphysicians believe that the so-called "Long Mai" is the place where the "son of heaven" can be born. Therefore, emperors of past dynasties not only cherished their family's Long Mai, but also tried to destroy "Long Mai" in other places to ensure the long-term stability of the world.

But in fact, it is difficult to cut off Long Mai in other places. Not only will a large number of craftsmen be called to cut off Long Mai, but it will also die. Yuan Tiangang, by contrast, knew that he had gone against God's will and deliberately left two places in Long Mai, but he didn't cut them down.

One of them is located in Taiyuan City, Shanxi Province. Because of his close relationship with Long Mai in the Tang Dynasty, Yuan Tiangang played Li Shimin, saying that Long Mai could protect the Tang Dynasty for hundreds of years. Once it is broken, it may have a bad influence on the Tang Dynasty. Li Shimin, after learning, agreed with Yuan Tiangang. Later, a generation of empress Wu Zetian came here, and even renamed the Tang Dynasty Zhou after she ascended the throne, which can be said to have subverted the existence of the Tang Dynasty to some extent.

Another dragon vein is located near Dangshan, Anhui. Yuan Tiangang inferred from the topography that Long Mai would overthrow the Tang Dynasty several hundred years later. But instead of reporting to Li, he consulted with Li in secret and kept it a secret together, because they knew that God's will was inviolable and the Tang Dynasty was about to perish. Sure enough, at the end of the Tang Dynasty, a man named Zhu Wen appeared near Long Mai. He put down the rebellion from all sides and gradually came to power, making the emperor of the Tang Dynasty a puppet at that time.