Yeah, I read some stuff about him. If I'm not mistaken he's the founder of the Mages Guild. He and Mannimarco were both apprentices to some mage dude. (I forgot his name). Then Mannimarco started getting into necromancy. Eventually Galerion founded the Mages Guild and led an army of battlemages to meet Mannimarco and his army. The good guys one, but Mannimarco turned himself into a lich, granting him immortality. Also, Galerion died during the battle.
How did I do, Knight Mariel?