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 is one of the Nine Men that became Nazgûl after receiving Rings of Power from the dark lord Sauron. 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
