Miyamoto Musashi (宮本 武蔵 c.May 19, 1584 or June 13, 1645), prior to adulthood known as Miyamoto Bennosuke or Miyamoto Musana, was a famous Japanese swordsman. He is believed to have been one of the most skilled swordsmen in history. Musashi, as he is often simply known, became legendary through his outstanding swordsmanship in numerous duels, even from a very young age. He is the founder of the Hyoho Niten Ichi-ryu, or Nito Ryu style of swordsmanship and wrote Go Rin No Sho, The Book of Five Rings, a book on strategy, tactics, and philosophy still studied by martial artists, businesspeople, and others even today.