§ Index of Names The Silmarillion

Melkor The Quenya name for the great rebellious Vala, the beginning of evil, in his origin the mightiest of the Ainur; afterwards named Morgoth, Bauglir, the Dark Lord, the Enemy, etc. The meaning of Melkor was 'He who arises in Might'; the Sindarin form was Belegur,but it was never used, save in a deliberately altered form Belegurth 'Great Death'. Passim (after the rape of the Silmarils usually called Morgoth); see especially 4-5, 8, 25, 50, 51, 70-1, 90-2, 117, 251, 320