Qualla: Ota Tenjinyama Kofun

Ota Tenjinyama Kofun: Introduction

Mon, 16 Feb 2026 00:00:00 GMT

From the air, it looks like a giant keyhole pressed into the earth -- one end perfectly circular, the other squared off, the whole form ringed by the dark water of a moat. The Ota Tenjinyama Kofun stretches 210 meters across the flat terrain of Gunma Prefecture, making it the largest burial mound in all of eastern Japan and the 28th largest in the country. Built in the early-to-mid 5th century, this massive earthwork was no accident of landscape. Someone commanded the labor of thousands to raise a three-tiered monument that would endure for over fifteen centuries. That someone's identity remains unknown.

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Ota Tenjinyama Kofun: A Kingdom Written in Earth

Mon, 16 Feb 2026 00:00:00 GMT

The tumulus sits on a low rise near the center of modern-day Ota, in eastern Gunma Prefecture. Its keyhole shape -- called zenpokoen-fun in Japanese -- is the hallmark of elite Kofun-period burial, reserved for rulers of significant power. The circular rear portion rises 16.5 met...

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Ota Tenjinyama Kofun: Clay Guardians and a Distant Coffin

Mon, 16 Feb 2026 00:00:00 GMT

Excavations have recovered both cylindrical haniwa and figurine haniwa shaped like people and houses from the mound's surface. These fired-clay figures once stood in rows along the tiers, serving as ritual guardians and markers of status. Their design places the kofun's construct...

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Ota Tenjinyama Kofun: The Ruler Nobody Can Name

Mon, 16 Feb 2026 00:00:00 GMT

Who warranted a tomb of this scale in the Kanto frontier? Scholars have debated the question for decades. The sheer size of the Ota Tenjinyama Kofun -- the only burial mound exceeding 200 meters in eastern Japan -- suggests someone who controlled the entire ancient Keno Province....

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Ota Tenjinyama Kofun: Companions in the Earth

Mon, 16 Feb 2026 00:00:00 GMT

The Ota Tenjinyama Kofun does not stand alone. Approximately 300 meters away lies the Nyotaizan Kofun, a large scallop-shaped tumulus with the same orientation and approximate construction date, separately designated as a National Historic Site. Paired tumuli of this kind -- one ...

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