Gandalf

Gandalf the Grey, later known as Gandalf the White, and originally named Olórin, was an Istar (Wizard), dispatched to Middle-earth in the Third Age to combat the threat of Sauron. He joined Thorin II Oakenshield and his company to reclaim the Lonely Mountain from Smaug, helped form the Fellowship of the Ring to destroy the One Ring, and led the Free Peoples in the final campaign of the War of the Ring.