Dawn
Dawn is an NPC, who was introduced with the Lord Blackthorn's Revenge expansion. She was a great warrior and great follower of Virtue, who had the honor of landing the killing blow on Lord Blackthorn when he and his minions invaded the city of Yew, shortly after the release of the Age of Shadows expansion. For her efforts she was rewarded with Dawn's Music Box.
Though she never caught on with players in terms of popularity or appreciation, she is nonetheless part of the history and lore of Ultima Online.
Her whereabouts are, officially, unknown, though a dev team member once commented off-handedly that she had married and retired quietly to Yew.