He is a Breton who sailed from High Rock to Cyrodiil in search for treasure. It is implied that he has been escaping justice for years and that he's also wealthy, as proven when the Hero unlocks his chest.
"What in blazes! You ain't one of me crew! Ye best start explainin' yerself, mate, if ye want to get off this ship alive!"
- [Say nothing.] "Oh, so you want to get cute, do you? All right then, mate, we'll do this the hard way!"
- The Dread Father summons you. "Huh? What are you, some kind of preacher or somethin'? One of them crazies from the Church? I ain't got time for this...."
- Justice is at hand, pirate. "Justice? Hahahahaha! I been avoidin' that all my life, mate! Let me show you how!"