<P> Tommen is seven years old at the beginning of A Game of Thrones (1996). He is the youngest child of Cersei and Jaime Lannister . </P> <P> Tommen 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 mother Cersei Lannister, his uncle Tyrion Lannister, and Sansa Stark . Tommen is mostly a background character in the novels . </P> <P> After King Joffrey's death in A Storm of Swords, Tommen is crowned and marries Joffrey's young widow, Margaery Tyrell . Tommen is a submissive child and, as a result, does everything that is asked of him . Thus, Cersei uses him to rule as she likes, though Margaery manipulates him into resisting his mother . </P> <P> Tommen Baratheon is the prince presented as the youngest son of King Robert Baratheon and Queen Cersei Lannister . Like his older siblings Joffrey and Myrcella, his actual father is his uncle Ser Jaime Lannister . Like his sister, he is good - natured and passive in contrast to his brother Joffrey . He is fond of his uncle Tyrion . </P>

Who becomes king after joffrey dies in game of thrones