The golden hand of the Kingslayer, Jaime Lannister.

Ser Jaime Lannister is the eldest son of Tywin, younger twin brother of Cersei, and older brother of Tyrion Lannister. He is involved in an incestuous relationship with Cersei, and unknown to most, he is the biological father of her three children, Joffrey, Myrcella, and Tommen.

Jaime previously served in the Kingsguard of Aerys Targaryen, known as the Mad King, before infamously backstabbing him during the Sack of King's Landing, earning Jaime the nickname of the Kingslayer.