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.
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
Jaime: Tell me you're not thinking of taking The Black.
Tyrion: And go celibate? The whores would go begging from Casterly Rock. I just want to stand on the edge and piss off the end of the world.