Lesser angelic spirits who serve the Valar, of the same order but lesser in power. Many Maiar are bound to specific Valar as servants and helpers. Some of the most significant figures in Middle-earth's history are Maiar: Sauron was originally a Maia of Aule before being corrupted by Morgoth; Gandalf, Saruman, and the other Istari (Wizards) are Maiar sent to Middle-earth in mortal form; the Balrogs are Maiar spirits of fire corrupted by Morgoth. Melian, who wedded the Elf-king Thingol, was also a Maia.