Olórin (Gandalf the Grey)

In Third Age Olórin began his sojourn in Middle-earth and over many centuries, he walked among the Elves as a stranger, learning from them and teaching them. Unlike Saruman, Olórin never took up permanent residence, and never went to the east, apparently restricting his activities to the Westlands of Middle-earth, where the remnants of the Dúnedain and the Eldar remained to oppose Sauron. He was known by many names during the long years he wandered: Elves named him Mithrandir, the "Grey Pilgrim", while the Men of Arnor coined Gandalf, which became his most common name. He was also known as Incánus in the South and as Tharkûn to the Dwarves. He later revealed himself as one of the Istari, and eventually became known as not only the wisest but also the most powerful of them.