Dong, also known as Emperor Fusang and Emperor Donghua, gradually became the ancestor of Quanzhen religion in the Song Dynasty. Dong's birthday is the sixth day of the second lunar month. In Taoist mythology, the Queen Mother of the West is in charge of all female immortals and Dong is in charge of all male immortals. The Jade Emperor is the head of the immortals and the emperor of the gods.
The appearance of Dong's name is closely related to the concept of Yin and Yang in the late Qin and Han Dynasties. So many important gods in Qin and Han dynasties became a pair of spouse gods. For example, in the pre-Qin period, Heng E married Yi, Fuxi married Nuwa, and Dong in the pre-Qin period also married the Queen Mother of the West. After being absorbed into Taoism at the end of the Han Dynasty, the two were juxtaposed, roughly below the Sanqing and above the Si.
Dong's data records.
Dongye Jing: In the barren hills in the east where Dong lives, there are large stone chambers. Ten feet long, full of white hair, humanoid bird face, tiger tail, carrying a black bear, looking around. Henghe throws a pot with a jade girl, and every time she throws 1200 corrections, those who can't get in or out will be booed by the sky; God laughs at those who correct it and get rid of it (wrongly) without picking it up.
"The Classic of the Chinese Emperor": There are copper columns in Kunlun Mountain, which rise into the sky, so-called Tianzhu. Fiona Fang is three thousand li, which is a shortcut. There is a stone room under it, square hundred feet, and the immortal nine houses rule it. There is a big bird in the sky, named Yu, flying south, covering Dong with Zhang Zuo and the Queen Mother of the West with Zhang Zuo. There is no feather in a small place on the back, 19 thousand Li. The Queen Mother of the West 18 years old boarded the wing and went to Dong Wang Gong.
Reference to the above content: Baidu Encyclopedia-Dong