Tommen I Baratheon is the legal son of King Robert Baratheon and Queen Cersei Lannister, but is actually the offspring of Cersei and her brother, Ser Jaime Lannister. He is the heir of his older brother, Joffrey I Baratheon, and rises to the throne after Joffrey's murder. He is the third husband of Queen Margaery Tyrell.