A 2022 investigation identified a clay burial on the projection containing a serpentine sword and shield-shaped bronze mirror. This is separate from the principal summit burial.
Finds & research
The projection burial yielded a serpentine iron sword about 237cm long (about 285cm including fittings), a shield-shaped bronze mirror, three additional mirrors, and combs.
Two views on the occupant
Archaeological view
A 109m round mound at Maruyama, Nara—the largest round kofun in Japan—dated to the late 4th century. An unlooted clay burial facility was found on its northeastern projection.
Imperial Household Agency view
This is not an IHA mausoleum; National Historic Site designation is not confirmed.
Field notes
Access may change with investigation and conservation work; follow current Nara City guidance.