According to one theory, 'The persons called Amaterasu who existed before and after the incident of Iwato-gakure (the hiding of Amaterasu Omikami, the sun goddess, in the heavenly rock cave) were different individuals, Himiko and Toyo respectively.'; therefore, this theory argues that it is proper to discuss the matter －Who was Toyo？－ together with the discussion of 'Who should be identified as Amaterasu?'.
一説には、「日本神話の岩戸隠れの前後のアマテラスは別の人物であり、それぞれ卑弥呼と台与である」として「アマテラスを誰に比定するか」という議論とともに考えようとするものがある。