Nakazawa Koto (中沢琴, 1839–October 12, 1927) was a Japanese swordswoman and Onna-musha of the Bakumatsu period. She joined the Rōshigumi and later Shinchogumi forces, and worked as a pro-Tokugawa agent in the Boshin War.
Source: “Nakazawa Koto”, English Wikipedia (CC BY-SA 4.0), excerpt