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Cassana of House Estermont married Steffon of House Baratheon. Steffon became the Lord of Storm's End when his father passed away. With him she had three sons: Robert, Stannis, and Renly. Lord and Lady Baratheon died in a shipwreck while their children were still young. Her father, Lord Estermont, was still alive at the time of the crowning of King Joffrey and swore loyalty to him.