Fordred Aran

Fordred Aran was an archmage who Arthas killed when he raided Dalaran. His ghost was later put to rest by Kael'thas and Vashj when they escaped from the Dungeons of Dalaran.

He may be a relative of Nielas Aran and Medivh.

There is a similarly named mage in the first mission of the undead campaign in Frozen Throne. He may or may not have been killed by Kel'Thuzad.

Trivia
His name was taken from a random archmage found in Warcraft III: Reign of Chaos.