Corwin

Corwin is the captain of the guard of Baron Almric's fortress in Ultima Underworld I. However, he only appears during the introducion of the game.

Corwin led the group of guards that found the Avatar in Arial's room, arresting him/her. However, when later reporting to Baron Almric, Corwin had to admit that they failed to rescue Arial. He had barely escaped with three of his men from the Abyss.

So the Baron sentenced the Avatar to find Arial. Corwin escorted him/her to the entrance and warned him/her that while he would wait outside, he would only open the door when hearing Arial's voice. He then locked the Avatar into the Abyss.