Istari

Wizards like Gandalf were immortal Maiar, but took the form of Men. The Wizards or Istari in J. R. R. Tolkien's fiction were powerful angelic beings, Maiar, who took the physical form and some of the limitations of Men to intervene in the affairs of Middle-earth in the Third Age, after catastrophically violent direct interventions by the Valar, and indeed by the One God, Eru Ilúvatar, in the earlier ages.

Two Wizards, Gandalf the Grey and Saruman the White, largely represent the order, though a third Wizard, Radagast the Brown, appears briefly, more or less as a plot device. Two Blue Wizards are mentioned in passing. Saruman is installed as the head of the White Council, but falls to the temptation of power. He imitates and is to an extent the double of the Dark Lord Sauron, only to become his unwitting servant. Gandalf ceaselessly assists the Company of the Ring in their quest to destroy the Ring and defeat Sauron. He forms the double of Saruman, as Saruman falls and is destroyed, while Gandalf rises and takes Saruman's place as the White Wizard. Gandalf resembles the Norse god Odin in his guise as the Wanderer. He has been described as a figure of Christ.