<P> Joffrey is portrayed by Irish actor Jack Gleeson in the HBO television adaptation . </P> <P> Joffrey Baratheon is not a point of view character in the novels, so his actions are witnessed and interpreted through the eyes of other people, such as his uncle Tyrion Lannister and his one - time fiancée Sansa Stark . Joffrey is mostly a background character in the novels . He inherits his mother's traditional Lannister looks, and has blond hair and green eyes, and is believed by many to be very handsome . </P> <P> In public, Joffrey is allegedly the oldest son and heir of King Robert Baratheon and Queen Cersei Lannister, both of whom entered into a political marriage alliance after Robert took the throne by force from the' Mad King' Aerys II Targaryen . In reality, his biological father is his mother's twin brother, Jaime Lannister . He has a younger sister, Myrcella, and a younger brother, Tommen, both of whom are also products of Jaime and Cersei's incestuous relationship . Their sole biological grandparents, Tywin and Joanna Lannister, were also first cousins . </P> <P> Joffrey is an amoral sadist who disguises his cruelty with a thin veneer of charm . This is best epitomized by his response when his (then) betrothed offends him: Joffrey pronounces that his mother had taught him never to strike a woman, and so commissions a knight of the Kingsguard to hit her instead . He enjoys forcing people to fight to the death, and enforces cruel punishments for lesser crimes . He has no sense of personal responsibility, blaming failures on others . He lacks self - control and often insults his allies and family members . Joffrey is one of the story's few characters to display no redeeming qualities whatsoever . </P>

Game of thrones who is joffrey's father