There is a viewpoint that he is, in fact, a fictitious character embodying several heroes in Yamato who lived in the period between the fourth and sixth or seventh centuries (a theory by Sokichi TSUDA).
実際には、4世紀から6世紀、7世紀頃の複数の大和(ヤマト)の英雄を具現化した架空の人物（津田左右吉説）という見方もある。