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