Morgoth, originally known as Melkor, is a central antagonist in J.R.R. Tolkien's legendarium, particularly in The Silmarillion. He is a powerful being, one of the Ainur, who turned to darkness and sought to dominate the world of Arda. Morgoth's actions led to immense suffering and conflict, as he corrupted many beings and sought to claim the Silmarils, three precious jewels created by Fëanor. As the first Dark Lord, Morgoth's influence is felt throughout Tolkien's works, shaping the history of Middle-earth. His defeat at the hands of the Valar marked a significant turning point, but his legacy of evil continued to affect the world long after his fall.