Morgoth Bauglir (originally Melkor) is a fictional character from J. R. R. Tolkien’s Middle-earth legendarium. He is the main antagonist of The Silmarillion, figures in The Children of Húrin, and is mentioned briefly in The Lord of the Rings.
Melkor was the most powerful of the Ainur, but turning to darkness, became Morgoth, the ultimate antagonist of Arda, from whom all evil in the world of Middle-earth ultimately stems. Sauron, one of the Maiar of Aulë, betrayed his kind and became Morgoth's principal lieutenant.
Morgoth was the principal agent of evil in The Silmarillion, and his influence lingered in the world even after he was cast from the world into the outer void. Morgoth's example provided later ages a cautionary tale against pride, wrath, envy, lust for power, and greed — and the destruction these visit upon oneself and others.
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.
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