There is a theory that the Fusumada no haka, where according to Engishiki (codes and procedures on national rites and prayers), Princess Tashiraka, the wife of Emperor Keitai, was buried, is not the Nishitonotsuka Tumulus but this tumulus.
延喜式に記されている継体天皇妃手白香皇女の衾田墓は西殿塚古墳ではなく、この古墳だという説がある。