Who was the first Taoist priest in history?

According to China's first panoramic biography of Taoist history-Preface: the cultural quintessence associated with the history of China, Changhong was the earliest alchemist in China. Because the Taoist priest was formerly an alchemist, he should be the first Taoist priest recorded in history. Of course, they were called alchemists at that time. The relevant contents of the original published links in Baidu Reading Web page are as follows:

According to historical records? According to Zen Mind, the earliest alchemist in ancient China was Changhong in the Western Zhou Dynasty.

Also as a macro. Uncle Zi, also known as Uncle Zhong. Zizhou, Sichuan, Zizhong County, Neijiang City. Zhou, the doctor of Liu Wengong in the Zhou Dynasty. Changhong 15, but comments can be found in Zuozhuan, Guoyu, Kong, Lv Chunqiu and Huainanzi.

It is said that because he is proficient in the theory of Yin and Yang and knows ghosts and gods, he was sealed by the king of Zhou. His main job at that time was to observe the astronomical phenomena, calculate the calendar, predict good or bad luck, predict the travel and daily life of the Zhou royal family, and predict and explain the natural and astronomical changes. In his later years, he helped his boss Liu Wengong's in-laws in the "Jin Qing infighting", so he was condemned and killed by Jin Qing Zhao Yang, and his loyal bones were buried in Beimang Mountain in Luoyang, Henan Province.

It is said that three years after his death, his heart turned into a ruby and his blood into a jasper, thus leaving the eternal legend of "Hong Hong Bi Hua" and "Loyalty".