Eddard Stark, Lord of Winterfell and Warden of the North, becomes the Hand of the King to Robert after Jon Arryn's death. He discovers Cersei and Jaime's secret, and is executed by Joffrey for treason soon after.
Jaime: It must be strange for you, coming into this room. I was standing right here when it happened. He was very brave, your brother. Your father, too. They didn't deserve to die like that. Nobody deserves to die like that. Ned: But you just stood here and watched. Jaime: Five hundred men stood here and watched. All the great knights of the seven kingdoms. Do you think anyone said a word, lifted a finger? No, Lord Stark, 500 men and this room was silent as a crypt. Except for the screams, of course, and the Mad King laughing. And, later, when I watched the Mad King die, I remembered him laughing as your father burned. It felt like justice.
Tyrion: Let me give you some advice bastard. Never forget what you are. The rest of the world will not. Wear it like armor, and it can never be used to hurt you. Jon: What the hell do you know about being a bastard? Tyrion: All dwarfs are bastards in their father's eyes.