But Heijiro NAKAYAMA, the professor of the Medical Department of Kyushu Imperial University, advocated an opiion that the construction site of Korokan was the ruins of Fukuokajo Castle after examining records including Manyoshu.
しかし、九州帝国大学医学部教授の中山平次郎が、万葉集の記述などを検討し福岡城址説を提唱した。