The fictional races and peoples that appear in J. R. R. Tolkien's fantasy world of Middle-earth include the seven listed in Appendix F of The Lord of the Rings: Elves, Men, Dwarves, Hobbits, Ents, Orcs and Trolls, as well as spirits such as the Valar and Maiar. Other beings of Middle-earth are of unclear nature such as Tom Bombadil and his wife Goldberry. Ainur The Ainur were angelic spirits created by Eru Ilúvatar at the Beginning. The Ainur who subsequently entered the physical world of Middle-earth were the Valar ("powers"), though that term came to refer primarily to the mightiest among them. Lesser spirits were called the Maiar. Most of the Valar and Maiar withdrew from Middle-earth to the Undying Lands of Valinor, though some of the Maiar assumed mortal forms to help or hinder the peoples of Middle-earth, such as the Istari (Wizards), Melian, Balrogs, and the Dark Lord Sauron. Wizards The wizards of Middle-earth were Maiar: spirits of the same order as the Valar, but lesser in power. Outwardly resembling Men but possessing much greater physical and mental power, they were called Istari (Quenya for "Wise Ones") by the Elves. They were sent by the Valar to assist the people of Middle-earth to contest Sauron. The first three of these five wizards were known in the Mannish tongues of the Lord of the Rings series as Saruman "man of skill" (Rohirric), Gandalf "elf of the staff" (northern Men), and Radagast "tender of beasts" (possibly Westron). Tolkien never provided non-Elvish names for the other two; one tradition gives their names in Valinor as Alatar and Pallando, and another as Morinehtar and Rómestámo in Middle-earth. Each wizard in the series had robes of a characteristic colour: white for Saruman (the chief and the most powerful of the five), grey for Gandalf, brown for Radagast, and sea-blue for the remaining two, known consequently as the Blue Wizards. Gandalf and Saruman play important roles in The Lord of the Rings, while Radagast appears only briefly, innocently helping Saruman to deceive Gandalf, who believes Radagast since he is honest, and fortuitously alerting Gwaihir to rescue Gandalf again. The Blue Wizards do not feature in the story, as they are said to have journeyed far into the east after their arrival in Middle-earth. As the Istari were Maiar, each one served a Vala in some way. Saruman was the servant and helper of Aulë,