Gwanggaeto Stele
Other authors point out that none of the placenames with proposed Japonic cognates are located in the historical homeland of Goguryeo north of the Taedong River, and no Japonic morphemes have been identified in inscriptions from the area, such as the Gwanggaeto Stele. The glossed place names of the "Samguk sagi" generally come from central Korea, in an area captured by Goguryeo from Baekje and other states in the 5th century, and suggest that the place names reflect the languages of those states rather than that of Goguryeo. This would explain why they seem to reflect multiple language groups. Kōno Rokurō and Kim Bang-han have argued for bilingualism in Baekje, with the placenames reflecting the language of the common people.