Nazgûl

See Ring-wraiths.

The slaves of the Nine Rings of Men and chief servants of Sauron. Also called the Black Riders, the Nine. See also Winged Nazgûl.

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Sauron's Nine Servants.
A word from the Black Speech, usually translated 'Ringwraith'; the name of the nine Men corrupted by the power of Sauron's Nine Rings, and transformed into his dark and deathless servants.

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What were the names of the nine Nazgûl?: One of them, the second in rank after the Lord of the Nazgûl himself, was named Khamûl, and also known as the Black Easterling. This is the only one of the nine Nazgûl explicitly named by Tolkien.