In the first year of the Meiji period, Kokugen-ji Temple was relocated from the holly precincts of Emperor Jimmu's mausoleum to the site where Okubo-dera Temple previously stood, but some people believe that the barrow in Misanzai was originally the stylobate of Kokugen-ji Temple Hojo do.
国源寺は明治初年、神武陵の神域となった場所から大窪寺の跡地へと移転したが、ミサンザイにあった塚はもとは国源寺方丈堂の基壇であったという説もある。