What is Tianyimen, the main gate in Feng Shui?

Tianyimen is located in the Imperial Garden on the Middle Road of the Forbidden City. It is the south gate of the Qin'an Hall courtyard. It was built when the Qin'an Hall courtyard wall was built in the 14th year of Jiajing's reign in the Ming Dynasty. It was originally named "Tianyi Gate" and was changed to "Tianyi Gate" in the Qing Dynasty.

According to the Yin Yang and Five Elements theory, the north belongs to water. The name of its courtyard gate is "Tianyi", which means "Heaven creates water" in the "Book of Changes", which corresponds to the theory of the Five Elements. In addition, because the Forbidden City was burned many times during the Jiajing period, the walls and gates of the Qin'an Hall were built under this background, and the gates were inscribed by Emperor Jiajing himself, also with the intention of praying for peace.