The Witch-king of Angmar is a fictional character from J.R.R. Tolkien's legendarium, primarily featured in *The Lord of the Rings*. He is the leader of the Nazgûl, also known as the Ringwraiths, and serves the dark lord Sauron. The Witch-king is known for his malevolent power and is a key antagonist in the story, particularly during the events of the War of the Ring. Originally a king of men, the Witch-king was corrupted by one of the nine Rings of Power given to mortal rulers. He established the realm of Angmar in the north, where he waged war against the kingdoms of Arnor. His reign of terror ended when he was defeated at the hands of Éowyn and Merry during the Battle of the Pelennor Fields.