Gandalf is a fictional character from J.R.R. Tolkien's Middle-earth legendarium, appearing in The Hobbit and The Lord of the Rings. He is a wizard, one of the Istari order, and the leader and mentor of the Fellowship of the Ring. Gandalf is described as an old man with a long white beard, wearing a wide-brimmed hat and a long grey cloak. He is known for his wisdom, knowledge, and great power.