Witch-king of Angmar

The Witch-king of Angmar, or simply referred to as the Witch-King, is the quaternary antagonist of The Lord of the Rings: The Fellowship of the Ring and The Two Towers and the tertiary antagonist of The Return of the King. He is one of the most trusted servant of Sauron who commands the Dark Lord's army and hopes to conquire all of Middle-earth.

However he was later killed by the Lord Théoden's niece, Lady Éowyn of Rohan with the assistance of Merry Brandybuck of the Shire.

Personality
The Witch-King of Angmar was presumably a once fair king. However, after being corrupted by the one of the Nine Rings, the Witch-king. He openly mocked Eowyn when she defended her uncle, which led to his ultimate downfall.