Tyrion Lannister is a character in fiction.
Catelyn Stark ( née Tully ) is a fictional character in the A Song of Ice and Fire series of fantasy novels by American author George R. R. Martin , and its television adaptation Game of Thrones . Joffrey Baratheon is a fictional character in the A Song of Ice and Fire series of epic fantasy novels by American author George R. R. Martin , and its television adaptation Game of Thrones . Tyrion Lannister . He first saves his own neck from the vengeful Catelyn Stark and her sister Lysa Arryn , then is tasked by his father Tywin to impose order on the capital of King 's Landing -- as well as his nephew Joffrey , the new king -- as civil war is sparked .