Joffrey is the eldest son and heir of King Robert Baratheon and Queen Cersei Lannister. He was actually the incest child of Cersei Lannister and her twin brother Jaime Lannister. King RobertAfter his death, Joffrey succeeded to the throne. He was a mean, unkind, arrogant, cruel, and narrow-minded man who was poisoned to death at his wedding banquet.