Yagyū Munetoshi was a famous Japanese swordsman. He was a student of Kamiizumi Ise-no-Kami Nobutsuna and later became known as a master of the Shinkage Ryu school of swordsmanship. He developed and expanded upon the school's teachings, where it would be known as Yagyu Shinkage Ryu. Maxims and school focus turned to a greater emphasis on speed, reservation, free flowing movement, smaller scale duels, and the concepts of Satsujinken (lit. "Swords that Kill") and Katsujinken (lit. "Swords that Give Life"). Yagyu introduced the style to Tokugawa Ieyasu, and urban legends revolve around him teaching the style to the ninja of Iga and Koga.
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