Barristan Selmy: Your enemies did not lie. When the people rose in revolt against him your father set their towns and castles aflame. He murdered sons in front of their fathers. He burned men alive with wildfire and laughed as they screamed, and his efforts to stamp out dissent led to rebellion that killed every Targaryen... except two.
Daenerys Targaryen: I'm not my father.
Barristan Selmy: No, Your Grace, thank the gods. But the Mad King gave his enemies the justice he thought they deserved. And each time, it made him feel powerful... and right... until the very end.