Japan's Largest Bronze Mirror Discovered

May 22, 2025 | News On Japan

NARA, May 22, 2025 (News On Japan) - A bronze mirror kept at Atori Shrine in the village of Atori has been identified as the largest seidōkyō, or ancient bronze mirror, ever found in Japan, according to a recent joint announcement by the Nara National Research Institute for Cultural Properties and the Nara National Museum.

The mirror, which has been preserved at the shrine for around 140 years, had long been regarded as a religious artifact, but its origin and scale were unclear until now.

The investigation revealed that the mirror has a diameter of 122 centimeters and weighs approximately 260 kilograms, making it the largest known example of its kind in the country. Inscriptions discovered on the reverse side of the mirror helped establish its provenance, providing rare historical insight.

At the center of the mirror is the prominent inscription "Daijingū," referring to the sun goddess Amaterasu of Ise Grand Shrine. Based on the style of the lettering and other clues, researchers believe the mirror was likely dedicated during the mid-Edo period by merchants involved in maritime trade who prayed for safe voyages. It is thought that following the Meiji-era separation of Shinto and Buddhism, the mirror was relocated from the Ise region to its current home at Asuka Niimasu Shrine.

One of the researchers involved in the study commented, "I've studied bronze mirrors for many years, but encountering a mirror of this scale was electrifying. Deciphering each character, I sensed layers of hidden history. This artifact holds untapped historical value not previously revealed in past studies."

The mirror will be on special public display at Asuka Niimasu Shrine on May 24th.

Source: 奈良テレビNEWS

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