George has posted a new set of clues for the role of Grenn (“aurochs stew”):
“You’re too dumb to make this soup the way they’re making it in Belfast. Start with Becky, Tom, and Boss. Take away two fathoms. Now you want the second course. In the dark the breaker of rocks seeks the living stone. But take away the fat guy with six wives, and the babe with the bumbershoot as well, that salty wench. Out, out. What’s left tastes good, but just remember, there is no gamecock in aurochs stew. IMDB? What’s that? I’m Dumb Boy? Won’t help you here, no way, no how.”
This clue attempts to obscure things by splitting up the actor’s name, but we believe we’ve solved it: Yorkshire-born actor Mark Stanley, who is/was a third year student at the Guildhall School of Music and Drama. Becky, Tom, and Boss are Mark Twain characters. Breaker of Rocks was the African nickname given to Henry Morton Stanley. Take away the Twain (the measurement from which Samuel Clemens picked his penname), take away Henry and Morton (by removing Henry VIII and the Morton Umbrella Girl), and you’re left with Mark Stanley. Another person of the same name happens to be a baseball player for the Univesity of South Carolina, whose team is named the Gamecocks.
ETA: GRRM confirms that Mark Stanley has been cast as Grenn.
As to IMDB being no help? The actor Mark Stanley has no apparent TV or film credits, and so does not appear in IMDB.