Two thousand, three hundred and ninety-three years ago, in 380 B.C., Plato wrote the myth of the Ring of Gyges, in which the shepherd, Gyges, discovers a ring that makes him invisible at will. Gyges promptly uses the protection this offers to infiltrate the royal household, seduce the queen, assassinate the king and take the kingdom. Plato goes on: "If now there should be two such rings, and the just man should put on one and the unjust the other, no one could be found, it would seem, of such adamantine temper as to persevere in justice."