Son of the Lord of Storm's End and Princess Rhaelle of House Targaryen. Steffon wed Lady Cassana of House Estermont. He became Lord of Storm's End upon his father's death. Lord Steffon was sent to the Free Cities by his first cousin, King Aerys II Targaryen, to find a bride for the king's heir, Prince Rhaegar. The mission proved unsuccessful, and Lord Steffon perished on his return when his ship, the Windproud, sank in Shipbreaker Bay.