Morgoth Bauglir ([ˈmɔrɡɔθ ˈbau̯ɡlir]; originally Melkor [ˈmɛlkor]) is a character, one of the godlike Valar and the primary antagonist of Tolkien's legendarium, the mythic epic published in parts as The Silmarillion, The Children of Húrin, Beren and Lúthien, and The Fall of Gondolin. The character is also briefly mentioned in The Lord of the Rings. Melkor is the most powerful of the Valar but he turns to darkness and is renamed Morgoth, the primary antagonist of Arda. All evil in the world of Middle-earth ultimately stems from him.
https://en.wikipedia.org/wiki/Morgoth