Orys Baratheon, from George R. R. Martin's novel saga 'A Song of Ice and Fire'
From aSoIaF wiki:
Orys was the rumored bastard half-brother of Aegon I. He was one of Aegon's fiercest commanders and was regarded as Aegon's only true friend. He rose through the ranks and became Hand of the King after Aegon's landing on mainland Westeros and his coronation.
During the War of Conquest he and Rhaenys atop of Meraxes was tasked with taking Storm's End. The Storm King Argilac, hearing of the fate of Harrenhal knew his formidable walls would not protect him from dragonfire, rode out to give open battle. Orys slew Argilac the Arrogant, who became the last Storm King. After the battle, Argella Durrendon, the daughter of Argilac, declared herself the Storm Queen and continued to hold Storm's End. Aegon rewarded Orys with Storm's End. After taking the Storm King's lands and castle he also took his daughter Argella as his wife and adopted the banner, honors and words of her line.
Even being the founder of Baratheon House, Orys was said to be a truly Targaryen, with violet eyes and silver/golden hair. The strong seed of the Storm Kings came from his wife.