Imperial Regalia of Japan

Lore & Background

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. They were eventually passed down to Emperor Jimmu, 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. When Amaterasu hid in a cave from her brother Susanoo-no-Mikoto, plunging the world into darkness, the goddess Ame-no-Uzume-no-Mikoto hung the mirror and jewels outside the cave and lured her out. 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.

Reader's Guide

The Three Sacred Treasures have been central to Japanese imperial authority for centuries. Since 690, their presentation to the Emperor by priests has been a key element of the enthronement ceremony. Under the pre-war 1909 Tōkyokurei and its addenda, the new emperor inherited the sword and jewel in a ceremony called the Kenji Tōgyo no Gi. Following postwar reforms, the same ceremony is conducted as the Kenji-tō-Shōkei-no-gi under the 1947 Imperial House Law. These items are by tradition seen only by the Emperor and certain priests. Their supposed locations are commonly thought to be the Atsuta Shrine in Nagoya (sword), the Three Palace Sanctuaries in Kōkyo (jewel), and the Ise Grand Shrine in Mie Prefecture (mirror). The importance of the regalia was evident at the end of World War II, when Emperor Hirohito ordered them protected 'at all costs' and expressed readiness to jump into the sea with them rather than let them fall into enemy hands. Scholars consider the regalia to represent the fusion of Japan's ancient indigenous groups with new arrivals, symbolizing that the emperor should unite ethnic groups without discrimination.

Did You Know?

• The Three Sacred Treasures consist of the sword Kusanagi no Tsurugi, the mirror Yata no Kagami, and the jewel Yasakani no Magatama.
• At the Battle of Dan-no-ura in 1185, the six-year-old Emperor Antoku and the Regalia were under the control of the Taira clan, and there are medieval texts relating to the loss of the sword.
• Emperor Hirohito in 1945 ordered the Lord Keeper of the Privy Seal to protect the regalia 'at all costs' and expressed readiness to die with them.

Mythological Origins and the Three Virtues

The Three Sacred Treasures — the sword Kusanagi no Tsurugi, the mirror Yata no Kagami, and the jewel Yasakani no Magatama — are rooted in a creation narrative that stretches back to the sun goddess Amaterasu. According to tradition, her grandson Ninigi-no-Mikoto carried these items down to Earth when she dispatched him to pacify the land. The mirror and jewel feature in the famous cave episode: when Amaterasu hid from her violent brother Susanoo, the goddess Ame-no-Uzume hung the mirror and jewels outside the cave mouth, luring her out with her own startled reflection. Susanoo, seeking to atone, later offered the sword Kusanagi, which he had extracted from the body of the eight-headed serpent Yamata no Orochi. The treasures were then passed to Emperor Jimmu, Ninigi's great-grandson and Japan's first sovereign. Each item embodies a core virtue: the sword stands for valour, the mirror for wisdom, and the jewel for benevolence. Together they confirmed the emperor's divine lineage as a descendant of Amaterasu and anchored his legitimacy as paramount ruler of the land.

Moments of Crisis — War and Survival

The regalia have weathered two defining moments of existential threat. At the close of the Genpei War in 1185, the six-year-old Emperor Antoku and the treasures fell under Taira clan control during the Battle of Dan-no-ura in the shallow Kanmon Straits. Medieval accounts offer conflicting stories about the sword's fate — some claim a replica was forged afterward, others that the lost blade was itself a copy, and still others that supernatural forces returned it to shore. In reality, replicas of both sword and mirror had been produced as early as the ninth century, and the original sword is believed to have been entrusted to Atsuta Shrine in Nagoya. A far more personal crisis came in July 1945. After the Potsdam Declaration, Emperor Hirohito confided to Lord Keeper Kōichi Kido that his greatest fear was the treasures falling into Allied hands. He declared he would move them close to himself, protect them at all costs, and if necessary, jump into the sea with them and share their fate.

The Hidden Ceremony and the Politics of Secrecy

Since 690, the presentation of the regalia to the new sovereign by shrine priests has anchored Japan's enthronement rite. Under the pre-war 1909 regulations the ceremony was called Kenji Tōgyo no Gi; after the 1947 Imperial House Law it became the Kenji-tō-Shōkei-no-gi. The rite remains strictly non-public — the items are seen only by the emperor and designated priests, and their physical locations are never officially confirmed. By common understanding, the sword rests at Atsuta Shrine in Nagoya, the jewel at the Three Palace Sanctuaries within the Imperial Palace in Tokyo, and the mirror at the Ise Grand Shrine in Mie Prefecture. Their first post-war appearance was during Akihito's accession in 1989–1990; their most recent was at Naruhito's enthronement, when he formally took possession on 1 May 2019. On every public occasion the treasures stayed wrapped in boxes, never revealed. Cambridge scholar Mikael Adolphson observes that this deliberate concealment adds mystique and thus authority to the objects, reflecting a Shinto tradition that is especially protective of its symbols and a broader Japanese reluctance to subject the regalia to historical analysis that might de-mythologize them.

Cultural Echoes Beyond the Palace

The phrase Three Sacred Treasures has long outgrown its original religious context and permeated modern Japanese culture. In a 2003 policy address, Prime Minister Junichiro Koizumi retroactively applied the term to consumer durables: the washing machine, refrigerator, and black-and-white television of the mid-1950s to mid-1960s, followed by the automobile, air conditioner, and colour television set of the late 1960s to mid-1970s. In the West, Alvin and Heidi Toffler's book Powershift borrows the trio to symbolize three forms of power — force (sword), wealth (jewel), and knowledge (mirror). In popular entertainment, the treasures are central to the narrative of Assassin's Creed Shadows and feature prominently in The King of Fighters. Scholars, meanwhile, read the regalia as a symbol of Japan's ancient indigenous groups merging with later arrivals, embodying the ideal that the emperor should unite all ethnic groups without discrimination. Representations of the three items continue to appear in Shinto rituals through the use of masakaki, keeping the symbolic thread alive in worship even as the originals remain hidden from public view.

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