Alcock will play the young Princess Rhaenyra Targaryen, while Carey portrays young Alicent Hightower.
The official House of the Dragon Twitter account has announced that Milly Alcock and Emily Carey (Wonder Woman, Tomb Raider) have joined HBO’s Game of Thrones prequel series.
Young Princess Rhaenyra Targaryen (Alcock) is the king’s first-born child, of pure Valyrian blood, and she is a dragonrider.
Young Alicent Hightower (Carey) is the daughter of Otto Hightower (Rhys Ifans), the Hand of the King, and the most comely woman in the Seven Kingdoms.