A twin-chambered mound in Gojono, Kashihara. The Agency for Cultural Affairs notes a view that it was the joint tomb of Empress Suiko and Prince Takeda. It is being developed as Ueyama Kofun Park.
A rectangular twin-chamber mound ~40m east–west and ~27m north–south as surviving (Agency for Cultural Affairs; Kashihara City gives ~30m for the remaining part). Its two double-sleeved horizontal stone chambers (each ~13m), set side by side east and west, hold an intact house-shaped sarcophagus of Aso welded tuff (Aso pink stone) in the east chamber (end of the 6th c.) and a unique stone door-sill in the west (early 7th c.). The gilt-bronze spangled fittings are horse trappings. The Agency for Cultural Affairs' designation account notes a view, based on comparison with the Nihon Shoki, the Kojiki and other records, that it was the joint tomb of Empress Suiko and Prince Takeda. Citing the Kojiki's statement that Suiko's tomb was first on the Ono hill and later moved to the great mausoleum at Shinaga (Yamada Takatsuka)↗, Kokugakuin University's mausoleum database records that Ueyama Kofun has been named as a candidate for the Ono-hill tomb.
Field notes
Part of Ueyama Kofun Park has been open since December 2021, but the west area containing the mound is still being developed and the kofun itself is closed (the chambers are to be restored and opened). About 9 minutes' walk from Kintetsu Okadera Station.