Ser Rodrik Cassel is a recurring character in the first and second seasons. He is played by guest star Ron Donachie and debuts in the series premiere. He also appears in a flashback in the sixth season, played by Fergus Leathem. Ser Rodrik Cassel is Master-at-Arms at Winterfell and a loyal servant to House Stark. Even in his old age he is still a skilled warrior. He was executed by Theon Greyjoy during the fall of Winterfell.