[Eomer of the Rohirrim]

Wait, you mean I get the first answer to a querie? I have moved up in the world! Ok, I'll give it my best shot.

The Valar sent five Wizards to Middle-Earth to guide the races against evil. The Wizards were Maiar. (if thats how you spell it) The White wizard was highest in the order and was called Saruman by men. Gandalf was the grey wizard and was second in the order. And Radagast was the Brown wizard and was third.
The other two were blue wizards and their dealings are unclear.

Gandalf was the only one who really succeeded in his task.