★ World Heritage Sakai, Osaka Keyhole-shaped mound

Gobyoyama Kofun

(IHA: Mozu Ryobo Sankochi)
LocationSakai, Osaka
ShapeKeyhole-shaped mound
Mound length203 m
PeriodEarly 5th c.
DesignationImperial Tomb (IHA)
World HeritageMozu-Furuichi Kofun Group (UNESCO)

Overview

A large keyhole mound (203m, 4th largest in the Mozu group) in Mozuhonmachi, Kita-ku, Sakai City. The three-tiered mound, 18.3m high at the rear circle, faces west and has a single projection on the south side of its waist. One moat is visible today, but a second, outer moat once encircled it and is preserved underground. Access to the mound itself is restricted as an IHA reference site. Located only about 500m southeast of Daisen Kofun, the two giant mounds together form the dominant landscape of the Mozu plateau. One of the 49 constituent monuments of the "Mozu-Furuichi Kofun Group" UNESCO WHS (2019).

Finds & research

The mound is built in three tiers, and cylindrical haniwa set edge to edge were recovered from the first terrace. On and around the projection (tsukuridashi) a wide range of figural haniwa came to light — notably an enclosure-shaped (kakoigata) haniwa among the largest known, and a house-shaped haniwa whose form recalls shrine architecture. Miniature vessels, underfired Sue ware and clay models of fish and baskets were also found, evidence of rites performed on the projection. The burial facility and grave goods remain uninvestigated under IHA management.

Two views on the occupant

Archaeological view
The occupant is archaeologically unknown. 203m long and 18.3m high at the rear circle, 4th largest in the Mozu area after Daisen, Kamiishizu Misanzai and Haze Nisanzai (Agency for Cultural Affairs). Three tiers; dated to the middle of the Middle Kofun period (first half of the 5th century). Located just southeast of Daisen Kofun, it is presumed to have a close relationship with that mound. Some identify it as the tomb of a figure connected to Emperor Ojin, as a Mozu-area counterpart to Konda Gobyoyama Kofun (the Emperor Ojin mausoleum) in the Furuichi group, but archaeological evidence is scant.
Imperial Household Agency view
Designated by the IHA as the "Mozu Ryobo Sankochi" (imperial mausoleum reference site) associated with Emperor Ojin. This lower-tier designation indicates a site possibly—but not definitively—related to an imperial burial. Administered by the IHA Shoryobu bureau. Identifying this mound as the tomb of Emperor Ojin is only one theory, and the IHA itself has made no definitive attribution. Access to the mound itself is restricted.

Field notes

About a four-minute walk southeast of JR Mozu Station. The front and rear sections can be observed from the moat-side path; convenient to combine with nearby Daisen Kofun and the Sakai City Museum.

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Sources

百舌鳥・古市古墳群 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)堺市「御廟山古墳内濠」

Related kofun

Daisen Kofun (486m) Kamiishizu Misanzai Kofun (365m) Haze Nisanzai Kofun (300m) Tadeiyama Kofun (148m) Itasuke Kofun (146m) Nagayama Kofun (100m)
← Haze Nisanzai Kofun Tadeiyama Kofun →