A Storm of Swords - Tyrion VI

It might serve, Tyrion had to concede, but the snake will not be happy. "Far be it from me to question your cunning, Father, but in your place I do believe I'd have let Robert Baratheon bloody his own hands."Lord Tywin stared at him as if he had lost his wits. "You deserve that motley, then. We had come late to Robert's cause. It was necessary to demonstrate our loyalty. When I laid those bodies before the throne, no man could doubt that we had forsaken House Targaryen forever. And Robert's relief was palpable. As stupid as he was, even he knew that Rhaegar's children had to die if his throne was ever to be secure. Yet he saw himself as a hero, and heroes do not kill children." His father shrugged. "I grant you, it was done too brutally. Elia need not have been harmed at all, that was sheer folly. By herself she was nothing.""Then why did the Mountain kill her?"