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Stannis Baratheon is a fictional character in the A Song of Ice and Fire series of epic fantasy novels by George R. R. Martin .
He is the second son of Steffon Baratheon and Cassana Estermont, as well as the brother of Robert – lord of the Seven Kingdoms, and Renly – lord of Storm's End .
He is portrayed by English actor Stephen Dillane in the HBO television adaptation of the series, who has received significant critical praise for his performance .
He has earned particular attention for the differences in his characterization between the novels and show, particularly during season five .
He is portrayed as a brooding and humorless man with a harsh but fair sense of duty and justice .