Mishima-no-Aino-no-Misasagi (Mausoleum of Emperor Keitai)
Location
Osaka Pref.
Shape
Keyhole-shaped mound
Mound length
226 m
Period
Mid-5th c.
Designation
Imperial Tomb (IHA)
IHA designation
IHA-managed (no public entry)
Overview
A 226m-long keyhole mound in Oda, Ibaraki, and the largest in the Mishima region. It is dated to the 5th century. The Imperial Household Agency designates it as Emperor Keitai's Mishima no Aino mausoleum, but the construction date does not align with Keitai's lifetime, so its archaeological occupant is unresolved.
Finds & research
Because it is administered as an imperial mausoleum, details of the burial facility and grave goods remain unknown.
Two views on the occupant
Archaeological view
Ibaraki City dates the mound to the 5th century, earlier than Emperor Keitai's death in 531. This chronological gap underlies the leading archaeological view that Imashirozuka was Keitai's tomb, but the occupant of Oda Chausuyama remains unidentified.
Imperial Household Agency view
The Imperial Household Agency administers the mound as Emperor Keitai's Mishima no Aino mausoleum. It is in Oda 3-chome, Ibaraki, and the Agency records its form as keyhole-shaped. The mound is closed to general entry.