Judging from that he lived over 100 years and that he achieved too many results (mentioned later) to believe they were done by a single person, it is commonly understood that he could have been a nonexistent emperor.
百歳を越える年齢、とても一人の人物が行ったとは思えない業績（後述）などから見て、実在の人物ではないとするのが一般的である。