King Thomas Baratheon

King Thomas I Baratheon is a major character in the first, seasons. He is played by starring cast member and debuts in the series premiere. Though believed by most to be the eldest son of King Robert Baratheon with Queen Cersei Lannister, Thomas 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 and Sarah Baratheon and Joffrey Baratheon and  both of whom share the same parentage.