Sakai, Osaka Keyhole-shaped mound

Mozu Otsukayama Kofun (site)

LocationSakai, Osaka
ShapeKeyhole-shaped mound
Mound length168 m
PeriodLate 4th c.
DesignationNot designated

Overview

A 168m-long keyhole mound formerly located in Uenoshiba-cho, Nishi Ward, Sakai. Built in the late 4th century, it was the fifth-largest mound in the Mozu group. Postwar soil extraction and residential development damaged it; an emergency excavation took place in 1949, and it had disappeared completely by 1985.

Finds & research

The eight clay-covered facilities yielded mirrors, beads, combs, and large quantities of swords, arrowheads, armor, and tools.

Two views on the occupant

Archaeological view
Once a 168m-long keyhole mound, it was the fifth-largest in the Mozu group. Investigation during its destruction identified eight clay-covered facilities, four in the rear circle and four in the front section; some appear to have held burials and others grave goods only.
Imperial Household Agency view
This was not an Imperial Household Agency mausoleum. Postwar soil extraction and residential development damaged the mound, which had disappeared completely by 1985.

Field notes

The mound no longer survives. Some excavated iron objects are displayed at the Sakai City Museum.

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Sources

堺市博物館「百舌鳥古墳群展示ガイド」大塚山古墳(PDF・5頁)堺市 古墳データベース(大塚山古墳の消滅を記載)

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