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  ====Third season====
  The dagger with which Roose Bolton kills Robb Stark, and the knife with which Catelyn Stark kills Walder Frey's wife.
  Following the Northern army's arrival at Harrenhal, Roose presents a letter from Ramsay claiming that the Ironborn sacked Winterfell before fleeing. Robb orders Roose and the Bolton forces to hold Harrenhal while the rest of his army rides to Riverrun. One of Roose's man-at-arms, Locke, captures the escaped Jaime Lannister and his escort Brienne of Tarth, cutting off Jaime's swordhand in the process, before bringing the two to Harrenhal. Roose agrees to let Jaime go, but keeps Brienne as a hostage, though Jaime later returns to secure her release. He then meets up with the Stark army at the Twins for the wedding of Edmure Tully and Roslin Frey. However, it is revealed that Roose has conspired with Lord Walder Frey to betray the Starks, and after the wedding the Freys and Bolton slaughter the Stark forces, with Roose personally killing Robb. As part of the Bolton-Frey alliance, Roose agrees to marry Walder's daughter Walda - Walder offers him the bride's weight in silver as dowry, so Roose decides to marry the fattest of Walder's daughters. In the aftermath of the massacre, Roose hints to Walder that his betrayal of Robb was motivated by resentment at having his advice ignored by Robb. Roose also reveals that Winterfell was actually sacked by his bastard Ramsay, who subsequently flayed the Ironborn garrison there and took Theon prisoner, for his own amusement. As reward for his defection, Tywin Lannister names Roose the Warden of the North.