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  === ''A Clash of Kings'' ===
  Robb continues to win victories against the Lannister army, and earns the nickname "Young Wolf" for his ferocity in battle.  He sends his mother Lady Catelyn to negotiate an alliance with Renly Baratheon, but Renly is assassinated by his brother Stannis Baratheon with blood magic from the red priestess Melisandre.  As Stannis and the Starks still share a common enemy, Robb invades the Westerlands in order to strategically assist Stannis's campaign against the Lannisters.  He also sends Theon Greyjoy to Pyke in hope to win the alliance of Theon's father Balon Greyjoy, ruler of the Iron Islands.  However Balon decides to take advantage and attack the North instead.  Theon joins his father and seizes Winterfell by surprise, where he is believed to have murdered Robb's youngest siblings Bran and Rickon, though in reality they have escaped and gone into hiding.