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, combs and other items.
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.
Field notes
Access may change with investigation and conservation work; follow current Nara City guidance.