Yuan Tiangang, who was born in the Sui and Tang Dynasties, was a diviner and deducer, and worked as a salt official at the end of Sui Dynasty. He once showed Dou Gui his face and predicted that he would make great achievements in the future, and these achievements were based on Liangzhou and Yizhou. Later, he rebelled with Tang Gaozu and was appointed as a senior official of Yizhou. At that time, the world was in turmoil, and Yuan Tiangang retired from the imperial court. Because he is proficient in Daoism, he walks around and does divination.
Once he went to Shanxi and met Wu Zetian's father. He worked out a magical divination at that time. He said that Wu Zetian would establish the Wu Zhou Dynasty and abolish the Tang Dynasty in the future, which was later confirmed. At that time, it seemed that Yuan Tiangang really had the gift of divine operators. And from then on, Yuan Tiangang became more fascinated with people, saying legends and stories like immortals descending to earth. And Yuan Tiangang himself does have a high talent in divination.
Yuan Tiangang later wrote many astronomical documents, including Feng Shui books and physiognomy books, among which Nine-day Xuan Nv Six-person Class, Yi Xuan Jing Yao, Five Elements Physiognomy Book, Ode to Yuan Tiangang, Three Dynasties Physiognomy Law, Taibai Club's Adversity and Generation, etc. were handed down to the world. This also made later people more curious about the mystery of him.