EW.com is reporting that a certain Holmes from BBC's Sherlock is headed to Westeros for the fourth season of HBO Game of Thrones

No, not Sherlock Holmes himself - actor Benedict Cumberbatch - but rather actor/writer/producer Mark Gatiss, who plays Sherlock's disapproving governmental older brother, Mycroft.Doctor Who fans may also know Gatiss from multiple roles on the long-running BBC sci-fi series, as well as having written episodes of the series along with Doctor Who novels.Exactly who Gatiss is playing on Game of Thrones is still a mystery. Although, with Season 4 still mostly being a continuation of George R. R. Martin's third Ice and Fire book, A Storm of Swords, there aren't that many big names coming next year. The most eagerly anticipated was Oberyn Martell - aka The Red Viper - but that role's now been filled by Pedro Pascal . And with a Chilean actor being cast as a denizen from Dorne, it's probably a good guess that the very English Gatiss won't be from Dorne.One possibility is that Gatiss could play () Mace Tyrell, Margaery's father and Lord of Highgarden and Warden of the South.What do you guys think?

Matt Fowler is a writer for IGN. Follow him on Twitter at @TheMattFowler , IGN at mattfowler , and Facebook at Facebook.com/Showrenity