Joffrey Baratheon is a character in A Game of Thrones.
Jack Gleeson ( born 20 May 1992 ) is a former Irish actor , best known for his portrayal of Joffrey Baratheon in the HBO television series Game of Thrones from 2011 to 2014 . 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 . Introduced in 1996 's A Game of Thrones , Joffrey is the eldest son of Cersei Lannister from the kingdom of Westeros . Joffrey is portrayed by Irish actor Jack Gleeson in the HBO television adaptation .