Joe Otterson TV ReporterThe “Game of Thrones” prequel series “House of the Dragon” at HBO has cast Milly Alcock and Emily Carey in recurring roles.“House of the Dragon” is set a few hundred years prior to the events of “Game of Thrones” and tells the story of House Targaryen and the Targaryen civil war that became known as the “Dance of the Dragons.”Alcock has been cast as the young version of Princess Rhaenyra Targaryen, the king’s first-born child, she is of pure Valyrian blood, and she is a dragonrider.
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