Xanthor
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Xanthor's portrait from Might and Magic VIII: Day of the Destroyer.
Court sage and advisor to 
Catherine.
Horn of the Abyss 
He was captured and imprisoned by the barbarians and eventually rescued by 
Bidley. In gratitude for being saved, he told Bidley the location of Island of the Vengeful Serpent - the resting place of the 
Horn of the Abyss. But the truth was, he hoped that the pirate would die. Bidley (and maybe others) believed him to be a 
Mage.
Later, after finally getting the Horn of the Abyss, Bidley was asked to give it to Gavin Magnus by 
Solmyr. He quickly suspected Xanthor of telling the Wizards about the Horn.
Lost Lore 
Xanthor (along with Marcus Finch) is a professor at the University of Erathia and the narrator of a few legendary accounts of events around Antagarich during the events of Heroes of Might and Magic III. According to these stories, he is the nephew of 
Agar and has 'little training in the mystical arts'.