A sacred stone monument believed to have been built in 1271 (the eighth year of Bun'ei) remains within an orchard located in Nampei, Hino City. The monument is said to be the grave of Taira no Koremori. This was built by a samurai named Taira no Suketsuna who lived in this area, in order to pray for the repose of Koremori's soul. Taira no Koremori was a descendant of the eldest son of Taira no Kiyomori, and he committed suicide by drowning himself in the sea of Kishū (Wakayama Prefecture) in 1183 (the first of year of Genryaku) during the Battle of Genpei.