Hanzō

also known as Was a legendary ninja who was the leader of Amegakure. He became famous around the time of the Second Great Ninja War. Little is known of his abilities aside from his riding on the head of a giant salamander (presumably a summon), but he was so powerful that he with his summon fought off all three Sannin. After their battle, he was so impressed with their strength that he decided to leave them if they agreed to accept the title of Sannin ("The Three Legendary Ninja"). He was later single-handedly defeated by Pain, under unknown circumstances. Every person that he was ever connected to was systematically killed, and at this point there is nobody left, besides Tsunade.