In the book version of The Fellowship of the Ring, Gandalf forbids anybody from calling Frodo “the Lord of the Rings.” That sinister honorific is reserved for Sauron only, who throughout all of Tolkien’s writings has many names: the Necromancer, the Lidless Eye, the Dark Lord, the Lord of Mordor, and the Nameless One. But, canonically, he also has many faces. He began his life as Mairon sometime in the First Age of Middle-earth and, in allying himself with another Dark Lord, Morgoth, he steadily gained a wide range of powers, including the ability to change his shape, including but not limited to: a serpent, a vampire and a werewolf.
