First, by presuming that the deceased person in Hashihaka-kofun Tumulus was Himiko (first known ruler of Japan), the deceased person in Nishitonotsuka-kofun Tumulus could be the next king such as Toyo (a relative and a successor of Himiko) (by Shiraishi, 1999).
まずは箸墓古墳の被葬者を卑弥呼と考え、台与らその次世代の王を西殿塚古墳の被葬者と考えるものである（白石1999）。