Maiar
Maiar (singular Maia) are angelic beings of great power. They were called into being by Iluvatar before the world, Arda, existed. They aided the more powerfull Valar in creating and adorning the world in preparation for the coming of Elves and Men. Notable among the Maiar are Sauron, Gandalf, Saruman, Radagast, Melian, Osse, and the Balrogs of Morgoth.