He apparently has some connection with Caerula. It is possible that they, as magicians, share the same goal of obtaining great power by opening the Mercurius Gate within the Cathedral City. Both he and Caerula use a sort of magic crystal ball to see great distances and also identify enemies.
He is credited as the narrator of Drakengard 3's opening introduction. The reason why the character appears to be an old man may have something to do with his life-stealing magic, the same technique that Caerula uses.