Imperial Household Agency: Iwasaka Tomb of Prince Ichinobe-no-Oshiha
Also known as: Koboshizuka
Location
Higashiomi, Shiga
Shape
Round tumulus
East mound diameter
16.5 m
Designation
IHA-managed tomb
IHA designation
Managed by the IHA (mound closed to the public)
Overview
The IHA-designated tomb of Prince Ichinobe-no-Oshiha at Koboshizuka in Ichinobe, Higashiomi, associated with the chronicles’ accounts of the prince and his sons, Emperors Kenzo and Ninken.
Finds & research
The Imperial Household Agency’s Archives and Mausolea Department bulletin (vol. 59) cites the Meiji-era survey record of the Ministry of Doctrine (Kyobusho) as noting that, on the eastern mound, the large stones of a stone enclosure were half buried in the soil.
Official status & archaeological view
Official status
Managed by the IHA as the Iwasaka Tomb of Prince Ichinobe-no-Oshiha, a son of Emperor Richu and the father of Emperors Kenzo and Ninken.
Attribution (jitei): the Imperial Household Agency's determination of whose tomb it manages — separate from heritage designation.
Archaeological view
The IHA’s 2006 survey report gives the present eastern round mound, designated as the prince’s tomb, a diameter of about 16.5m and height of about 3.5m. The separate western mound measures about 7.5m across and 1.9m high. Excavation for the new torii did not establish when either mound was built.
Field notes
According to Shiga Prefecture's tourism information, about 20 minutes on foot from Ichinobe Station on the Ohmi Railway Yokaichi Line.