Because no record showing that this is an imperial mausoleum is included in "Kojiki" (The Records of Ancient Matters), in "Nihonshoki" (Chronicles of Japan) nor in "the Engishiki" (an ancient book for codes and procedures on national rites and prayers), there is a theory in which this tumulus should be excluded from the tumuli for Emperors.
『記・紀』や『延喜式』などに陵墓としての伝承がないので、大王墓から外す考えもある。