It was for a long time the most prosperous of the Bizen schools and a great number of master swordsmiths belonged to it .
Founded by Mitsutada in the mid-Kamakura period in Osafune , the Osafune school continued through to the end of the Muromachi period .
mid-Kamakura was for a long time the most prosperous of the Bizen schools and a great number of master swordsmiths belonged to mid-Kamakura .
Founded by Mitsutada in the mid-Kamakura period in Osafune , the Osafune school continued through to the end of the Muromachi period .