Lord Steffon Baratheon was the son of Lord Ormund Baratheon and Princess Rhaelle Targaryen. He's well-remembered for being the father of Baratheons Robert, Stannis, and Renly. He was the grandson of King Aegon V Targaryen, and first cousin to Aerys II Targaryen.
He had black hair and blue eyes, with a strong and square jawline, like most past Baratheons.
Steffon became an advisor to King Aerys II on the small council during the Defiance of Duskendale. Aerys wanted the Prince of Dragonstone to have a bridge of noble birth from an old Valyrian bloodline, so he sent Steffon to Volantis to find one. Many thought that if Steffon succeeded, he would replace Tywin with him as the new Hand of the King. Steffon failed to find a suitable wife for Prince Rhaegar, but he did say that he had found a very good fool. He claimed that the fool was so funny that he could teach Steffon's son Stannis how to laugh.
Upon his return on the Windproud, Steffon got caught in a storm in Shipbreaker Bay. The Windproud sank just a few kilometers away from Storm's End, killing Steffon and his wife, Cassana Baratheon, along with the crew. There was one survivor, however: the fool. Patchface. Patchface had gone insane from the storm and the sinking ship. Some believe that Lord Steffon's death was the cause of King Aerys's madness and paranoia, because when he heard about Steffon's death, he was furious and blamed Tywin Lannister for perpetrating his death so that he wouldn't be replaced as the King's Hand.
Steffon's successor was his eldest son and heir, Robert Baratheon, who would later become the King of the Andals, the Rhoynar, and the First Men.