Drudgeworth

Drudgeworth is a prisoner in Castle Britannia.

The Avatar found him in a cell in the basement in Ultima V, and Drudgeworth said the hero was the first person he'd seen in months. When asked about his sentence, he never really said exactly what had happened, but went on about how Chuckles was responsible for his imprisonment, that he hadn't killed "her" (whose identity got never revealed), and it wasn't his fault, claiming that he could show the Avatar where "it" was hidden if the hero released him.

Ultima V: Lazarus
In Ultima V: Lazarus, Drudgeworth will bitterly complain that the Avatar is the first person he'd seen in months who wasn't a guard, barely able to control his seething anger. He rants that he didn't mean to kill 'her', and can't imagine why everyone believes Chuckles story instead of his own. Drudgeworth will still attack without explanation if freed.

Trivia

 * Should the Avatar free Drudgeworth, he'll show his true colors and attack the party as soon as possible. He has no further elaboration on what happened, and no conversation with him will get him to lead the party anywhere except into combat. A little more on his rantings can, it seems, be learned from thoroughly investigating Chuckles' room, but the jester himself has nothing to say on the matter, going so far as to deny even knowing Drudgeworth.