Also a title in the
Belgariad, and
Mallorean trilogies by
David Eddings. The title is given to one of the
disciples of the god
Aldur who has attained mastery of sorcery by succesfully using the
Will and the Word. The prefix "Bel" is added to the beginning of the sorcerer's original name, for example:
Garath => Belgarath
Garion => Belgarion
Din => Beldin
Makor = Belmakor
etc....
you get the idea.
The prefix "Pol" is used in much the same way for female disciples who have attained mastery of sorcery as well. But that is another story.