Elder son of Lord Tywin Lannister. He is a knight and member of the Kingsguard.

He has secretly fathered three children with his twin sister Cersei: Joffrey, Myrcella, and Tommen. Everyone believes they are the children of King Robert Baratheon.

Jaime was raised to the Kingsguard at the tournament of Harrenhal in the year of the false spring. During the sack of King's Landing by his father, he killed Aerys II Targaryen in violation of his oaths. He was allowed to remain on the Kingsguard.

He is with Robert when he comes to Winterfell to see Lord Eddard Stark. While there, he is caught in the act of having sex with Cersei by Eddard's son Bran, whom he pushes off a tower, leaving him crippled.

When he learns of Catelyn's abduction of Tyrion, he accosts Eddard in the streets of King's Landing and has his men kill Eddard's escort. He flees the city and joins Lord Tywin at Casterly Rock to raise an army to secure Tyrion's release.

He leads a large force against the Lords Vance and Piper near the Golden Tooth and sends them reeling, finally ending at Riverrun, where he defeats another army gathered by Ser Edmure Tully, whom he captures. He then divides his men into three camps to besiege the castle. He is ambushed and captured by Robb Stark.

While on campaign, he is named Lord Commander of the Kingsguard by Joffrey after he dismisses Ser Barristan Selmy.