In Kyushu dynasty theory, gengo (era name) was certainly established in that various countries of Korean Peninsula such as Silla established the original gengo, and it is hard to think that Wa who recognized themselves as the leader of the peninsula didn't establish their original gengo, and that `AME no Tarishihoko' referred to himself as `Hiizurutokoronotenshi' declaring that he is `tenshi' (emperor).
九州王朝説では、この時期既に新羅等の朝鮮半島の諸国は独自の元号を建てており、半島の盟主を自認していた倭だけが独自の元号を建てることがなかったとは有り得ず、また阿毎多利思北孤などは「日出處天子」と名乗っており「天子」と宣言している以上、元号の制定は当然であるとしている。