Sauron

Sauron is the evil Dark Lord who is the main antagonist of the Lord of the Rings series. Sauron was originally a servant of the fallen valar Morgoth. In the second age Sauron created the rings of power: nine for men, seven for the dwarves and three for the elves. Then unknown to the bearers of these rings he created another ring, the one ring to rule them all. He used this ring to control Middle-earth. He was conquered at the end of the second age by Isildur who cut off Sauron's finger thus depriving him of the power of the ring. Sauron however was not completely vanquished since Isildur would not distroy the One Ring. Sauron later attempts to regain his power and his ring, but he is thwarted by the efforts of Frodo Baggins and the Fellowship of the Ring who finally manage to distroy the ring by throwing it into the fires of Mount Doom.