The Name
The name Morgoth is Sindarin (one of Tolkien's invented languages) and means "Black Foe of the World"; Bauglir is also Sindarin, meaning "Tyrant" or "Oppressor". "Morgoth Bauglir" is actually an epithet: his name in Ainulindalë (the creation myth of Middle-earth and first section of The Silmarillion) is Melkor, which means 'He Who Arises In Might' in Quenya, another of Tolkien's languages. This too is an epithet since he, like all the Ainur, had another true name in Valarin (in the legendarium, the language of the Ainur before the beginning of Time), but this name was not recorded. The Sindarin equivalent of Melkor was Belegûr, but it was never used; instead a deliberately resembling name Belegurth, meaning "Great Death", was employed.
Melkor was not called "Morgoth" until he destroyed the Two Trees, murdered Finwë and stole the Silmarils in the First Age. The darker name was then bestowed by Fëanor, son of Finwë; and the Elves called him thereafter by that name alone.
Like Sauron, he had a host of other titles: Lord of the Dark, the Dark Power of the North, and Great Enemy. The Edain called him the Dark King and the Dark Power; the Númenóreans corrupted by Sauron called him the Lord of All and the Giver of Freedom.
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Famous quotes related to the name:
“Do not ask the name of the person who seeks a bed for the night. He who is reluctant to give his name is the one who most needs shelter.”
—Victor Hugo (18021885)