FANDOM


King Joffrey I Baratheon was the eldest son and heir to King Robert Baratheon. Though believed by most to be the eldest son of Robert and Queen Cersei Lannister, Joffrey is actually a bastard born from Cersei's incestuous relationship with her twin brother, Ser Jaime Lannister of the Kingsguard. He is the older brother of Myrcella Baratheon and Tommen Baratheon, both of whom share the same parentage with Cersei and Jaime Lannister. He was poisoned at his wedding in a plot orchestrated by Littlefinger and Olenna Tyrell

(source GOT wiki)