"Game of Thrones" has cast Ciaran Hinds to play Mance Rayder, the King Beyond the Wall, in the fantasy drama's upcoming third season.

Hinds, who's finishing up a stint on USA's "Political Animals" playing a very thinly-disguised version of Bill Clinton, has had practice wielding a sword and shield on HBO, as he played Julius Caesar on "Rome." 

Mance was discussed frequently in the show's second season, but never seen. Hinds joins a new wave of "GoT" actors, including Diana Rigg and Mackenzie Crook.

The third season will premiere on March 31, 2013.

Alan Sepinwall has been reviewing television since the mid-'90s, first for Tony Soprano's hometown paper, The Star-Ledger, and now for HitFix. His new book, "TV (The Book)" about the 100 greatest shows of all time, is available now. He can be reached at sepinwall@hitfix.com