Ser Jamie Lannister is also known as the Kingslayer – the name given to him when he murdered the Mad King Aerys Targaryen, the previous ruler of Westeros. He is part of the rich and powerful Lannister family, who rule Westeros from The Red Keep in King’s Landing. Jamie is a knight in the Kingsguard and is known for being a skilled swordsman and fighter. He is in a secret incestuous relationship with his twin sister Cersei and is the biological father of her three children. Unlike his sister and father, he is close to his brother Tyrion, who he does not blame for their mother’s death.