A landform within Tennoji Park that remains the subject of academic debate as to whether it is a keyhole mound or natural topography. Estimated length ~200m. In the Winter Siege of Osaka (1614) Tokugawa Ieyasu headquartered here; in the Summer Siege (1615) Sanada Yukimura allegedly did the same—a legend passed down since the Edo period through storytelling, kabuki, and rokyoku ballads. If confirmed as a kofun, its size would make it the largest within Osaka City, but excavation has been insufficient to verify this.
Finds & research
As the site's status as an ancient burial mound is still debated, few confirmed archaeological finds exist. The site is widely known as a Sengoku-era battlefield (Siege of Osaka, 1614–1615). No kofun-specific artifacts have been confirmed. Currently maintained as parkland within Tennoji Park, with public recreation taking precedence over archaeological investigation.
Two views on the occupant
Archaeological view
Occupant unknown. Academic opinion is divided between those who consider this a keyhole mound and those who attribute it to natural topography later shaped by humans. If it is a kofun, it would be dated to the 5th century, with some estimates placing the mound length at around 200m. Excavation records are limited and stone covering, haniwa, and stone chambers have not been definitively confirmed. In the Winter Siege of Osaka (1614), Tokugawa Ieyasu established his headquarters here; in the Summer Siege (1615), Sanada Yukimura (Nobushige) allegedly did the same.
Imperial Household Agency view
Not managed by the IHA. Administered by Osaka City within Tennoji Park. No record of imperial or aristocratic designation; the occupant is unidentified. Academic debate continues over whether this landform is actually a kofun or a naturally formed hill later modified by humans. It is also widely known as a historic site from the Siege of Osaka (1614–1615).
Field notes
Today incorporated into the everyday public space of Tennoji Park, adjacent to the Osaka City Museum of Fine Arts and Tennoji Zoo—allowing for a half-day itinerary combining art viewing with kofun and battlefield exploration.