Sauron is a fictional character and the main antagonist of the Middle-earth legendarium of J.R.R. Tolkien (with Morgoth as the overarching antagonist) along with being the titular main antagonist of Tolkien's classic high fantasy epic novel series, The Lord of the Rings. He also serves as the secondary antagonist of mythopoeic novel, The Silmarillion, a major antagonist in The Children of Húrin, the overarching antagonist of The Hobbit, and the secondary antagonist of The History of Middle-earth. Sauron was once a noble Maia known as Mairon and once the greatest smith of Aulë, one of the Valar, he joined with the first Dark Lord Morgoth in the First Age, becoming his chief lieutenant. During the Second Age after his master was banished, Sauron became the second Dark Lord of Middle-earth who resided in the lands of Mordor and created the One Ring, which he lost upon his defeat against the Last Alliance of Men and Elves. His main goal was to reclaim the One Ring and rule Middle-earth in darkness, but the Ring's destruction would ultimately be his downfall at the end of the Third Age. He was also the archenemy of Aragorn, the future King of Gondor; Frodo Baggins, the Ring-bearer; and the wizard, Gandalf the Grey (later White).