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  ===''A Storm of Swords''===
  Upon his recovery in ''A Storm of Swords'' (2000), Tyrion finds that he has lost most of his nose, and a returned Tywin has assumed the position of Hand himself. Tyrion is appointed Master of Coin, the treasurer, as a reward for his successful leadership. After learning of a Tyrell plot to claim Winterfell through marriage to Sansa, Tywin forces Tyrion to marry her instead. Sympathetic to Sansa's situation, Tyrion leaves their marriage unconsummated, despite his father's orders to conceive a child with her as soon as possible. At the celebration of his wedding to Margaery Tyrell, Joffrey is poisoned. Cersei promptly accuses Tyrion, who is arrested. His previous good deeds forgotten, Tyrion is put on trial as Cersei manipulates the proceedings to ensure a guilty verdict. He is heartbroken to find that even Shae has turned against him. In his grief, Tyrion demands a trial by combat, to which Cersei responds by naming the virtually unbeatable Gregor Clegane as her champion. Oberyn Martell agrees to fight for Tyrion but dies in the attempt. Pronounced guilty, Tyrion is taken to the dungeon to await his execution. Jaime frees him with the help of Varys, eventually confessing his complicity in Tywin's ruin of Tyrion's first wife Tysha. Furious, Tyrion swears revenge on his family for a lifetime of cruelty and lies to Jaime that he did murder Joffrey. Before escaping the palace, Tyrion goes to confront his father, and finds Shae in Tywin's bed. After strangling her in a rage, Tyrion murders Tywin as well with a crossbow when he speaks ill of Tysha, and flees Westeros in a ship organized by Varys.