"House of the Dragon": The "Game of Thrones" Prequel Has a Full Cast

Lord Corlys Velaryon, played by Steve Toussaint, stems from a Valyrian bloodline that's as "old as House Targaryen." His character, also referred to as "the Sea Snake," is considered to be the most famous marine adventurer in the history of Westeros. He "built his house into a powerful seat that is even richer than the Lannisters and that claims the largest navy in the world."