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Tevildo was the "Lord of Cats" in The Tale of Tinúviel. He appeared in the form of a great black cat with a collar of gold. During the Quest for the Silmaril, Beren was captured by Melko and sent as a servant to Tevildo. However the cat was defeated by Huan and Tinúviel when they forced him to reveal the spell which held the stones of his castle together and which held cats under his evil sway. When his collar was removed the other cats shrunk.
Later Tevildo's place in the narrative was replaced by that of the Necromancer, Thû (later renamed Sauron), in the legendarium. Thû (and later Sauron) was the "Lord of Werewolves", in contrast to Tevildo's position as "Lord of Cats"; the cat-versus-dog theme prominent in the Tale of Tinúviel was thus eliminated in later writings.
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