An emergence-period round mound amid Yasu's housing. Its three triangular-rimmed mirrors are prime evidence that early Yamato's mirrors reached even a modest Omi mound.
Finds & research
Three triangular-rimmed mirrors (1896; one a type-mate of Tsubai-Otsukayama); presumed direct coffin burial.
Two views on the occupant
Archaeological view
A round mound 26–30m across of the late 3rd century. Reclamation in 1896 yielded three triangular-rimmed mirrors — one, by the Chen workshop (21.8cm), matches a mirror from Tsubai-Otsukayama in Kyoto. The burial was likely a direct coffin interment; the mound was capped and preserved after a 1974 survey.
Imperial Household Agency view
Not designated by the IHA. Part of the National Historic Site "Oiwayama Kofun Group" (added 1985).
Field notes
Freely visitable in a small park-like plot; the rise is slight.