Callisto is a young man in the Inner City Tavern with a problem. His lover it is a noble woman far above his station, who is in a dispute with her brother over inheritance all of their parent's estate. She has also been kidnapped by a rogue band of Assassins, and is being held for ransom which Callisto cannot afford. He asks Scarlett to undertake the Heir to the Mansion quest to rescue his beloved (whose name is either Sara or Lady Yasmin, depending on which clue you believe.).
Callisto only appears after the Persian occupation has ended (in the seat at the tavern previously occupied by the Guard Captain of the Inner City in the Tavern.)