As a supplement to this, and because only one other Game of Throne website seems to be saying it, Gary Oliver will be in a minor role in Season 4 of Game of Thrones.
Both IMDb and the actor's website state that Mr. Oliver will be portraying a Braavosi captain in an Alex Graves-directed episode. Mr. Graves will be directing four episodes of season 4 (episodes 2, 3, 8, and 10) so I don't know what knowledge IMDb is using to identify Mr. Oliver's place in episode 10. Mr. Oliver has previously been cast as Abraham and Joseph Stalin, so, he's well-rounded to say the least.
If this character is the character from the novels that I'm thinking of, then he gets to react to someone telling him Valar morghulis.
aaahhh this makes me so excited!! i know a lot of people aren't a fan of arya's storyline in affc/adwd but personally i love it so here for this tbh.