Archaeologists have recovered extraordinary artifacts from Emperor Nintoku's tomb for the first time in over a century and a half. The remarkable discovery includes a gold-plated ceremonial knife and gilded armor fragments that had been missing since 1872, when they were secretly removed from Japan's largest burial mound. These precious relics, now authenticated by modern science, offer unprecedented insights into the opulent funeral practices of Japan's ancient imperial court during the 5th century AD.
The artifacts emerged from an unexpected source - the private collection of Masuda Takashi, a prominent Japanese industrialist and art collector who lived during the mid-19th to mid-20th centuries. Kokugakuin University acquired these treasures from an art dealer in 2024, marking a historic moment for Japanese archaeology. The items still bear their original paper wrappings with handwritten labels and the authentic seal of Kaichiro Kashiwagi, the builder who first documented the tomb's contents.
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Aerial view of the Daisenryo Kofun, Japan's largest burial mound and believed tomb of Emperor Nintoku, showing the distinctive keyhole shape characteristic of imperial Kofun tombs. (Copyright © National Land Image Information)
The Daisenryo Kofun: Japan's Greatest Imperial Monument
The Daisenryo Kofun stands as Japan's most magnificent burial monument, stretching 486 meters in length with the distinctive keyhole shape characteristic of elite Kofun period tombs. Located in Osaka Prefecture, this colossal structure is believed to house the remains of Emperor Nintoku, the 16th Emperor of Japan who reigned from 313 to 399 AD explains a Heritage Daily report. The tomb ranks among the world's three largest burial monuments alongside Egypt's Great Pyramid and China's Mausoleum of the First Emperor.
The 1872 incident that led to these artifacts' disappearance began with a landslide that exposed part of the tomb's stone burial chamber. Kaichiro Kashiwagi, tasked with restoration work, meticulously documented the tomb's contents including knives, armor, helmets, sword fittings, and glassware. However, as royal tombs were strictly protected from excavation, Kashiwagi was required to seal the chamber after recording his findings. Unknown to authorities, he appears to have secretly retained several precious items.
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Scientific Analysis Reveals Imperial Craftsmanship
Modern examination of the recovered artifacts has yielded fascinating insights into ancient Japanese metallurgy and ceremonial practices. The gold-plated knife features an iron blade housed in its original Japanese cypress sheath, encased in an extraordinarily thin gold-plated copper plate measuring only 0.5 millimeters thick and secured with five silver rivets. Archaeologists believe this represents unique craftsmanship, as no other gold-plated small knives from 5th-century kofun burials are known to exist.
Gold plated knife and categorization sheaf in which it was found. (Kokugakuin University)
The armor fragments, measuring 3 to 4 centimeters in size, revealed surprising technological sophistication. Scientific analysis showed they were iron coated directly with gold, contradicting earlier 19th-century illustrations that suggested gold-plated copper construction. This discovery refines understanding of elite craftsmanship during Emperor Nintoku's reign and demonstrates the advanced metallurgical skills of ancient Japanese artisans.
Prestige Objects of Divine Authority
Archaeologist Taro Fukazawa of Kokugakuin University emphasized the ceremonial nature of these discoveries, stating:
"These were not battlefield weapons. They were prestige items, created solely as offerings, demonstrating the immense political and economic power of the imperial court."
The artifacts represent the pinnacle of ceremonial craftsmanship, designed to accompany Japan's most powerful ruler into the afterlife and reflect the divine authority associated with imperial burial practices.
The recovery of these lost treasures provides the first physical evidence from Emperor Nintoku's tomb to be examined using modern scientific methods. This breakthrough offers unprecedented opportunities to understand the sophisticated burial customs, political structures, and artistic achievements of Japan's early imperial period. The artifacts will be preserved and studied further to unlock additional secrets about this pivotal era in Japanese history.
Top image: Parts of a gold-plated knife that have been recovered from Emperor Nintoku's tomb. Source: Kokugakuin University
By Gary Manners
References
Milligan, M. 2025. Lost treasures from Emperor's tomb recovered. Available at: https://www.heritagedaily.com/2025/08/lost-treasures-from-emperors-tomb-recovered/155797
Radley, D. 2025. First confirmed artifacts from Emperor Nintoku's 5th-century tomb in Japan. Available at: https://archaeologymag.com/2025/08/first-confirmed-artifacts-from-nintokus-tomb/
