★ World Heritage Fujiidera, Osaka Keyhole-shaped mound

Otorizuka Kofun

LocationFujiidera, Osaka
ShapeKeyhole-shaped mound
Mound length110 m
PeriodEnd of 4th–mid-5th c.
DesignationNational Historic Site
World HeritageMozu-Furuichi Kofun Group (UNESCO)

Overview

A keyhole mound 110m long with a rear circle 12.3m high, built on the western edge of a north-south plateau with its front section facing south. Its construction is unusual: three tiers on the rear circle and two on the front section, with a notably high rear circle. Projections stand on both sides of the waist, and a narrow horseshoe-shaped moat surrounds the mound. The moat is thought never to have held water and is preserved underground. Fujiidera City's mound profile dates it to the end of the 4th century (another Fujiidera City article gives the early 5th century), the official World Heritage website to the first half of the 5th century, and the Agency for Cultural Affairs to the middle phase of the Middle Kofun period. Part of the National Historic Site Furuichi Kofun Group, it is a constituent monument of the Mozu-Furuichi Kofun Group World Heritage Site, inscribed in 2019.

Finds & research

A clay-encased burial is reported in the rear circle, furnished with iron swords, blades, spears and arrowheads. A bronze mirror and an iron sword from the front section suggest another burial facility; one further bronze mirror is also reported. Cylindrical and figural haniwa have been recovered, and a helmet-shaped haniwa found nearby is also known.

Official status & archaeological view

Official status
Part of the National Historic Site "Furuichi Kofun Group". The publicly owned parts are looked after by the Fujiidera City Board of Education and are freely open to visitors, although no site development has yet been carried out there (preservation and utilization plan, 2023).
Archaeological view
Occupant unknown. It stands just south of Komuroyama Kofun (150m). When built, the slopes were faced with stone and cylindrical haniwa stood along the flat terraces.

Field notes

Archaeological excavation has been conducted; the exterior is accessible for viewing.

World Heritage guide featuring this kofunMozu-Furuichi World Heritage Kofun A Visitor's Guide to the 49 Tombs →
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Sources

百舌鳥・古市古墳群 世界遺産公式サイト文化庁 文化遺産オンライン(世界遺産構成資産解説)藤井寺市 文化財保護課「大鳥塚古墳と赤面山古墳」藤井寺市「大鳥塚古墳」(4世紀末葉)藤井寺市教育委員会・羽曳野市教育委員会『史跡古市古墳群保存活用計画』(2023年)

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