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Imperial Regalia of Japan

Three legendary treasures

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Through Japan, Mirror and World War II

Representations of the regalia are used in masakaki in many Shinto rituals.

Legend

According to legend, these treasures were brought to Earth by Ninigi-no-Mikoto, legendary ancestor of the Japanese imperial line, when his grandmother, the sun goddess Amaterasu, sent him to pacify Japan. These treasures were eventually said to be passed down to Emperor Jimmu, who was the first Emperor of Japan and Ninigi's great-grandson. Traditionally, they were a symbol of the emperor's divinity as a descendant of Amaterasu, confirming his legitimacy as paramount ruler of Japan. When Amaterasu hid in a cave from her brother Susanoo-no-Mikoto, thus plunging the world in darkness, the goddess Ame-no-Uzume-no-Mikoto hung the mirror and jewels outside the cave and lured her out of hiding. Upon emerging from the cave, Amaterasu was so startled by her reflection in the mirror that it gave the gods an opportunity to extract her. Susanoo later presented the sword Kusanagi to Amaterasu as a token of apology; he had obtained it from the body of an eight-headed serpent, Yamata no Orochi.

At the conclusion of the Genpei War in 1185, the six-year-old Emperor Antoku and the Regalia were under the control of the Taira clan. They were present when the Taira were defeated by the rival Minamoto clan at the Battle of Dan-no-ura, which was fought on boats in the shallow Kanmon Straits. Although there are some medieval texts relating to the loss of the sword, which variously contended that a replica was forged afterwards, or that the lost sword itself was a replica, or even that the sword was returned to land by supernatural forces; replicas of the sword and mirror were actually made as early as the 9th century, and the original sword is considered entrusted to Atsuta Shrine in Nagoya.

The importance of the Imperial Regalia to Japan is evident from the declarations made by Emperor Hirohito to Kōichi Kido on 25 and 31 July 1945 at the end of World War II, when he ordered the Lord Keeper of the Privy Seal of Japan to protect them "at all costs". When Supreme Commander for the Allied Powers (GHQ) arrived in Japan, Emperor Hirohito's greatest fear was that the Three Sacred Treasures would fall into enemy hands. In a diary entry by Kōichi Kido dated 31 July, after the Potsdam Declaration, Emperor Hirohito told Kido, "In the end, I think it would be best to move the sacred treasures of Ise and Atsuta close to me and protect them. ... In the event of an emergency, I believe there is no other option than to protect them myself and share their fate," and expressed his readiness to jump into the sea with the sacred treasures and die if the situation came to that.

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