Jaime Lannister is the first born son and thus the rightful heir to the High Lord Tywin Lannister. Jaime is a member of the Kingsguard and is known as the Kingslayer for having slain King Aerys during Robert's Rebellion. He is twins with the queen, Cersei, whom he has been having an affair with; in addition, he is Joffrey's real father.

Jaime Lannister Quotes

Jaime: My point is, we don't choose whom we love. It just well... it's beyond our control. I sound like an idiot.
Myrcella: No you don't.
Jaime: What I'm trying to say. What I'm trying and failing to say...
Myrcella: I know what you're trying to say.
Jaime: No, I'm afraid you don't.
Myrcella: I do. I know about you and mother. I think a part of me always knew and I'm glad. I'm glad that you are my father.

Give my regards to the Night's Watch. I'm sure it will be thrilling. And if it's not, it's only for life.

Jaime

Game of Thrones Quotes

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.

I will hurt you for this. A day will come when you think you are safe and happy, and your joy will turn to ashes in your mouth. And you will know the debt is paid.

Tyrion Lannister