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 haniwa pieces, including cylindrical and figural types (designated a Hikone City cultural property). A wheel-stone fragment survives at Enju-ji, but its attribution to this mound is uncertain. 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. Cylindrical and figural haniwa have been recovered. A wheel-stone fragment held at Enju-ji has not been securely attributed to this mound. 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. The 188 city-designated haniwa pieces are held at the Hikone City Kaikoku Memorial Hall.