Musashi was a famous samurai. Nobody ever defeated him. When he grew old he wrote "The five rings". You can search for the book on Internet. He was said to have developed a fencing method with both hands.
His life was described in the triology MUSASHI and the MUSASHI drama series of NHK. I like the drama series better.
Surprisingly, the theme music was written by Ennio MORRICONE.
To my dear THIEN!
