The name Hatsukunishirasu Sumera Mikoto was also conferred upon Emperor Jinmu (whose name is given as Hatsukunishirasu Sumera Mikoto in the Nihon Shoki but written using different characters); it originally had the meaning of an emperor who governed the entire country, however, this indicates that there were two emperors who first ruled the country.
ハツクニシラススメラミコトとの称は、神武天皇（『日本書紀』では始馭天下之天皇はつくにしらすすめらみこと）にも贈られており、初めて天下を治めた天皇という意味であるが、初めて国を治める天皇がふたり存在することになる。