On the one hand, Emperor Tang Ming's visit to the Moon Palace reflects that under the comprehensive action of official advocacy and Taoist beliefs, the Mid-Autumn Festival has become an important part of people's lives, so stories and legends with related themes are favored.
On the other hand, it shows that many Taoist priests, including Ye Fashan, have played an active role in maintaining national stability and caring for people's well-being, and their image of helping the country and the people is deeply rooted in the hearts of the people, making "Tang Wang has a Covenant" widely spread.
Behind the Moon Wandering by the King of the Tang Dynasty
The story of "The Tang King's Visit to the Moon" is recorded in Taoist documents such as Biography of Tang Ye written by Zhang Daotong in the Southern Song Dynasty. Its embryonic form comes from Ming Taizu Miscellaneous Notes written by Zheng Chuhui in the Tang Dynasty, in which there is a story of "Immortals of Yuan Dynasty bestowed Ziyun Music".
Since the middle Tang Dynasty, Xuanzong's visit to Guanghan Palace has been widely included in various documents. Later compilers added many contents one after another to enrich the text. For example, in Bai Juyi's Six Poems of the White House, in addition to the protagonist Li Longji, Ye Fa was added to lead the Tang emperor to the moon, which made the legend more logical.