★ World Heritage Fujiidera, Osaka Keyhole-shaped mound IHA imperial tomb

Oka Misanzai Kofun

Also known as: Mausoleum of Emperor Chuai
LocationFujiidera, Osaka
ShapeKeyhole-shaped mound
Mound length245 m
PeriodLate 5th c.
DesignationIHA-managed tomb
World HeritageMozu-Furuichi Kofun Group (UNESCO)
IHA designationManaged by the IHA (mound closed to the public)

Overview

A keyhole mound 245m long (242m in some sources), the third largest in the Furuichi area. It was built on the north-east edge of the Habikino hills with its front section facing south; the rear circle rises 19.5m. The mound has three tiers and a projection only on the east side of the waist. A broad moat surrounds it, and cylindrical haniwa also stood on the embankment. Although reused as a castle and altered in the Muromachi period, its overall form survives. The Imperial Household Agency administers it as the mausoleum of Emperor Chuai. Its construction date is disputed; the Agency for Cultural Affairs assigns it broadly to the Middle Kofun period. It is a constituent monument of the Mozu-Furuichi Kofun Group World Heritage Site, inscribed in 2019.

Finds & research

Details of the burial facility and grave goods are unknown. Cylindrical and figural haniwa have been recovered from the mound and moat, and cylindrical haniwa also stood on the surrounding embankment.

Official status & archaeological view

Official status
The IHA lists its official form as zenpo-koen (keyhole). Officially designated "Ega-no-Nagano-no-Nishi-no-Misasagi" (Mausoleum of Emperor Chuai) by the IHA.
Attribution (jitei): the Imperial Household Agency's determination of whose tomb it manages — separate from heritage designation.
Archaeological view
The occupant has not been archaeologically identified. Fujiidera City dates the mound to the end of the 5th century; the official World Heritage site, noting differing views, places it between the second half of the 4th century and the second half of the 5th century; and the Agency for Cultural Affairs, also noting that opinions differ, assigns it more broadly to the Middle Kofun period.

Field notes

Public access is restricted. The mausoleum is at 4-chome Fujiidera, Fujiidera, Osaka. Per the IHA, it is about a 14-minute walk from Kintetsu Fujiidera Station, and worship is generally possible year-round from 8:30 to 17:00. The goryoin (mausoleum seal) is kept at the Furuichi Mausolea Office in Habikino, Osaka, where visitors can use it free of charge (reception 8:30–17:00; staff may be unavailable on weekends, holidays, 29 Dec–3 Jan and some other days).

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Sources

宮内庁文化庁 文化遺産オンライン(世界遺産構成資産解説)藤井寺市「仲哀天皇陵古墳(岡ミサンザイ古墳)」宮内庁 陵印について百舌鳥・古市古墳群 世界遺産公式サイト「仲哀天皇陵古墳」

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