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House of the Dragon - Rhys Ifans, Steve Toussaint, Eve Best & Sonoya Mizuno Join Cast of HBO’s Game of Thrones Prequel

HBO’s House of the Dragon has rounded out its main cast with the addition of Rhys Ifans, Steve Toussaint, Eve Best and Sonoya Mizuno.

They join Paddy Considine, Olivia Cooke, Matt Smith and Emma D’Arcy in the straight-to-series Game of Thrones prequel from George R.R. Martin, Ryan Condal and Miguel Sapochnik.

Toussaint’s Lord of House Velaryon
Comes from a Valyrian bloodline as old as House Targaryen. As “The Sea Snake,” the most famed nautical adventurer in the history of Westeros, Lord Corlys built his house into a powerful seat that is even richer than the Lannisters and that claims the largest navy in the world. Danny Sapani was previously in talks for the role.

Ifans will play Otto Hightower
The Hand of the King, Ser Otto loyally and faithfully serves both his king and his realm. As the Hand sees it, the greatest threat to the realm is the king’s brother, Daemon, and his position as heir to the throne.

Best is cast as Princess Rhaenys Velaryon
A dragonrider and wife to Lord Corlys Velaryon, “The Queen Who Never Was” was passed over as heir to the throne at the Great Council because the realm favored her cousin, Viserys, simply for being male.

Mizuno plays Mysaria
Who came to Westeros with nothing and has been sold more times than she can recall. She could have wilted… but instead she rose to become the most trusted — and most unlikely — ally of Prince Daemon Targaryen, the heir to the throne.