Is there really a Yuan Tiangang in history?

Yuan Tiangang did exist in history, but the date of birth and death is unknown. China, the most famous fortuneteller in the Tang Dynasty. Chengdu, Sichuan. Astronomers, astrologers, forecasters, feng shui masters, Taoist priests and fortune tellers in the late Sui and early Tang Dynasties. Being good at study style, he was so tired that he was ordered by Yan Guan in Sui Dynasty and Huojing (Lin Qiong) in Tang Dynasty.

Regardless of all kinds of legends, only from the perspective of the real existence of the characters:

There is a public temple in the southeast of Chang 'an County, which is the ancestral temple in memory of the poet Du Fu. The ancestral temple is located on the loess slope. Above the loess slope is a flat land. On this highland, not far away, there are two tombs of famous people in the Tang Dynasty, one is Li, an imperial envoy of the Tang Dynasty, and the other is Yuan Tiangang, a famous Buddhist teacher in the Tang Dynasty.