On the map describing the ancient conditions of this area, those two tumulus were noted as the South/North Mausoleums of "Kataokano Iwatsukino-oka Imperial Mausoleum, which could be the origin of the names of local places, such as Iwazono or Iwatsuki-bashi Bridge (the bridge over Takada-gawa River situated east of the tumulus).
古地図には、共に片岡石杯岡（かたおかのいわつきのおか）の北陵・南陵として記されてもおり、付近の地名である磐園（いわぞの）や、磐築橋（いわつきばし：東方の高田川にかかる橋）の名のいわれと思われる。