Reda Shrine (Atsuta Shrine) is located in the heart of Nagoya City, Aichi Prefecture, Japan. It is one of the three major shrines in Japan, and is a solemn and sacred cultural relics of the Japanese royal family. The area is 190,000 square meters, built in the style of gods, and the roof is covered with copper plates. The main sacrifice of the Retian God Palace is the Retian God (Tian Congyun Sword), the Xiangdian sacrifice of the Retianzhao God, Suzhan Mingzun, Japan Wuzun, etc. The hyida shrine is said to have been built in the 3rd century by the concubines of the Japanese Wu Zunxuan, used for the use of the grass sword, that is, one of the three Japanese artifacts of the Tianyeyun sword. It is also said that the grass sword has been lost in the battle of the Tanzhipu and sunk to the sea.