Game of Thrones
Ser Rodrik Cassel was the Master-at-Arms of Winterfell for House Stark. As the Master-at-Arms he trained the Stark children at arms, along with Theon Grejoy. Ser Rodrik is a barrel-chested man with bushy white eyebrows, and long bushy whiskers. He is described as a loyal and courageous man, who does not partake in things he considers frivolous, such as music and dancing.
Ser Rodrik did not accompany Lord Eddard Stark to King’s Landing, but rather, stayed in the North, in order to help Robb Stark in his new role as Lord of Winterfell. When Lady Catelyn Stark decides to go to King’s Landing to bring proof of the Lannister’s role in the attempted murder of Bran, Ser Rodrik goes with her.
After King’s Landing, Ser Rodrik accompanies Lady Catelyn on her journey back to Winterfell, and the two capture Tyrion Lannister (with the help of other sell-swords), because Lady Catelyn thinks that Tyrion was the one who ordered the assassination of her son, Bran. After the events of the Eyre, where Tyrion wins his freedom in a trial by combat (using Bronn as his champion), Ser Rodrik and Lady Catelyn come upon Robb Stark’s army as they march to King’s Landing.
Ser Rodrik leaves Lady Catelyn in the care of her son, and he goes back to Winterfell to help Maester Luwin advise the new Lord of Winterfell, Bran. While there, Ser Rodrik gathers the remaining garrison of Winterfell, and he defends the castle against the Ironborn led by Theon Greyjoy. Ser Rodrik and his men fought valiantly, but ultimately the Ironborn won, and with Theon threatening to hang his daughter Beth, Ser Rodrik gives himself over to the former friend of House Stark. Theon, deciding to make an example of Ser Rodrik, executed the Master-at-Arms, in front of the remaining people of Winterfell.