Wicked Elf who betray the good to Morgoth. Maeglin was the son of Aredhel and Eol. Aredhel often told Maeglin tales of Gondolin, and so she ran away with him to her old city. Eol followed, and he was trapped there, it being a secret city. He cose to died, and his son to die, but Aredhel protected her son and was killed. Maeglin later betray the Elves to Morgoth.