What bodhisattva's birthday is September 15th?
Buddhism believes that avalokitesvara is a bodhisattva with great compassion, and all victims only need to recite its name, "Bodhisattva can watch its voice immediately" and rescue themselves, hence the name. In the Tang Dynasty, Li Shimin's name was taboo, so he changed the word "world" to "Guanyin" for short.
As for Guanyin Bodhisattva, its name is listed in Volume 82, Volume 100, etc. They are Daming Heart Sutra, Vimalakīrti Sutra, Shining Prajna Sutra, Ode to Prajna Sutra and Dabaoji Sutra, but their deeds are not listed. In Hokkekyo, there is an article detailing the stages of the bodhisattva's life in her mother-in-law's world.
Guanyin Bodhisattva is one of the four great Buddhists in China. According to legend, his birthday is February 19, enlightenment day is June 19, and nirvana day is September 19. It is said that the Dojo is Putuo Mountain. Guanyin belief has a far-reaching influence in China, resulting in various folklore about Guanyin Bodhisattva.