Sakyo no shin Munemitsu was the second son of Rokurozaemon Sukemitsu (see lot 8). He is believed to have been retained by Akamatsu Masanori around the time of manufacture of this blade, and together with his brother Katsumitsu fought on behalf of Masanori against the Yamana clan in 1483 at the start of the Oyamaguchi War (1483-88). He later travelled to Kyoto on more than one occasion together with Masanori, and performed demonstrations of sword-making there. Munemitsu taught Masanori the art of sword-making, and this is documented on some extant blades. He also worked in Bitchu and Omi, and is considered thereby to have influenced the eventual dissemination of the Bizen style in the Kansai region and elsewhere.