The Witch-King (my favorite character) is the leader of the 9 ringwraiths. He is the Lord of Angmar, and is one of Sauron's most loyal and trusted servants. He led the host of Minas Morgul (Minas Ithil) against the defenders of Minas Tirith. There, the Witch King had a showdown with Gandalf, who was reduced to a sniveling bottom-feeder. The Witch-King was then in the process of slaying Eowyn when the cowardly hobbit named Merry stabbed him in the back of the leg FROM BEHIND. There goes the Witch-King, unfairly defeated by a coward.