A National Historic Site whose huge chamber stands exposed in a residential area. It is interpreted as a tomb of a Hata-clan leader, but the occupant is not established.
Finds & research
The double-sleeved horizontal chamber survives. The attribution and details of older finds cannot be established from current Kyoto City guidance alone.
Two views on the occupant
Archaeological view
A keyhole mound at Uzumasa Omokage-cho, Ukyo Ward, Kyoto, reconstructed at about 75m long. Built around the 7th century, its mound is largely gone, leaving a 17.8m double-sleeved horizontal chamber—the largest in Kyoto Prefecture.
Imperial Household Agency view
This is not an IHA mausoleum. The area containing its huge chamber is a National Historic Site managed by Kyoto City.
Field notes
Advance application to Kyoto City’s Cultural Properties Protection Section is required. Check current conditions and do not enter the chamber without permission.