Qualla: Shibayama Kofun Cluster

Shibayama Kofun Cluster: Introduction

Mon, 16 Feb 2026 00:00:00 GMT

Photo credit Abasaa, Public domain. Fifty meters of mourners, sculpted in clay, marching in eternal procession toward a burial chamber that has not been opened in nearly fifteen hundred years. The Shibayama Kofun Cluster, a group of ancient burial mounds on a plateau overlooking the Kido River in Chiba Prefecture, preserves one of the most extraordinary archaeological finds in Japan: a complete funeral procession rendered in haniwa -- terracotta figures placed around tombs during the Kofun period. Designated a National Historic Site in 1958, the cluster sits not in its namesake town of Shibayama but in neighboring Yokoshibahikari, on the Kujukuri Plain of the Boso Peninsula. The mounds have endured here since the latter half of the 6th century AD, silent witnesses to a vanished aristocracy.

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Image: Abasaa | Public domain

Shibayama Kofun Cluster: Keyhole Kingdoms

Mon, 16 Feb 2026 00:00:00 GMT

Photo credit Alexrk2, CC BY-SA 3.0. The cluster contains 15 burial mounds: two large keyhole-shaped kofun and 13 smaller dome-shaped tumuli. The keyhole shape -- a square front joined to a circular rear -- is a distinctly Japanese tomb form called zenpokoenfun, reserved for rulers and elites. The larger of the two ...

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Image: Alexrk2 | CC BY-SA 3.0

Shibayama Kofun Cluster: A Tomb Painted Red

Mon, 16 Feb 2026 00:00:00 GMT

Photo credit Abasaa, Public domain. The Tonozuka's horizontal stone burial chamber was painted red on the interior -- a ritual practice believed to symbolize vitality and the power of the deceased. When archaeologists explored the double moat, they discovered that dozens of haniwa had been preserved in the soft mud...

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Image: Abasaa | Public domain

Shibayama Kofun Cluster: The Procession That Never Ends

Mon, 16 Feb 2026 00:00:00 GMT

Photo credit Abasaa, Public domain. The Himezuka yielded the cluster's most astonishing discovery. Its haniwa were found in situ -- still standing exactly where they had been placed some 1,500 years earlier. Stretching 50 meters from the front of the tumulus to the rear burial chamber entrance, a procession of clay...

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Image: Abasaa | Public domain

Shibayama Kofun Cluster: Guardians in Clay

Mon, 16 Feb 2026 00:00:00 GMT

Photo credit Abasaa, Public domain. The remaining 13 dome-shaped tumuli in the cluster, each roughly 20 meters in diameter, remain unexcavated and well preserved. Many of the artifacts recovered from the Tonozuka and Himezuka are displayed at the Shibayama Haniwa Museum, housed in the grounds of the temple Kannonky...

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Image: Abasaa | Public domain