Miyamoto Musashi (c. 1584–1645) was a Japanese swordsman, philosopher, and strategist, renowned for his undefeated record in more than 60 duels. He authored *The Book of Five Rings*, a treatise on martial strategy that continues to influence not only martial arts but also leadership and business. Musashi founded the Niten Ichi-ryū style of swordsmanship. His life embodies the samurai ethos of discipline and mastery.