Rurarz describes five main theories about Mimana, the first of which was proposed by Suematsu. A second theory about Mimana was proposed by North Korean scholar Gim Seokhyeong, who suggested that Mimana was a political entity from the Korean Peninsula (possibly Gaya) who had a colony on the Japanese islands, somewhere around the modern-day city of Ōyama, Ōita in Ōita Prefecture; thus "Nihongi" should be understood as referring only to the Japanese islands and Jingū's conquest a description of a migration to a land in the Japanese Archipelago, not the Korean Peninsula. This is related to the so-called horserider invasion theory in which horse riders from the Korean Peninsula are hypothesized to have successfully invaded Japan, and in so doing introduced horses, not native to the islands, to Japan. A third theory has been proposed by Japanese scholar Inoue Hideo, who argued that ancient Japanese Wa people might have settled a region in the Korean peninsula as long ago as around the Neolithic, and the Mimana state was an enclave of this group. A fourth theory was put forward by South Korean scholar Cheon Gwan-u, who argued that the events present a history of the Korean Baekje state, which was allied with Yamato Japan, and whose leaders fled there after Baekje's fall in the 7th century. In this version, Mimana would refer to Baekje, or some poorly understood fragment of that state, that fought against Gaya. The fifth theory, which Rurarz describes as a "compromise version of recent young Japanese and Korean scholars" argues that there never was a Mimana state as such, and the term refers to Japanese diplomatic envoys active in the Korean peninsula in that era.