Shiga's second-largest keyhole mound, stretched along the summit of Mt. Kojin above Lake Biwa in Hikone. Reached by a hill path, the mound conveys the reach of an early chieftain who ruled lake and plain — best enjoyed as part of a hike.
Finds & research
188 cylindrical and figural haniwa pieces and a wheel-stone fragment. The presumed pit-style chamber is unexcavated.
Two views on the occupant
Archaeological view
A 124m keyhole mound — second largest in Shiga — built near the summit ridge of Mt. Kojin around the end of the 4th century, a classic hilltop early-period tomb. The burial, presumed a pit-style chamber, is unexcavated. 188 haniwa pieces and a fragment of a wheel-stone have been recovered. Its lord likely commanded the Koto plain and Lake Biwa navigation.
Imperial Household Agency view
Not designated by the IHA. National Historic Site (2011) — Hikone's third, after Hikone Castle and the Ii family cemetery.
Field notes
Reached via the Kojinyama Shrine approach and hiking trails (on-site interpretation is limited). Finds are held by the Hikone Castle Museum annex (not on permanent display). Fine lake views from the top.