The Lord of the Nazgûl, also called the Witch-king of Angmar, the Pale King, or Black Captain, is a fictional character in J. R. R. Tolkien's fantasy novel The Lord of the Rings. He was one of the Nine among Men that the dark lord Sauron gave Rings of Power, becoming Nazgûl or Ringwraiths. His ring gives him great power, but enslaves him to Sauron and makes him invisible. As a wraith, he had once established himself King of Angmar in the north of Eriador. From Wikipedia
