https://www.thewrap.com/house-of-the-dragon-princess-rhaenyra-targaryen-alicent-hightower-younger-milly-alcock-emily-carey/

The Game of Thrones prequel series has added Milly Alcock as the Young Princess Rhaenyra Targaryen, the king’s first-born child. And Emily Carey will play Young Alicent Hightower, the daughter of Otto Hightower, the Hand of the King, and the most comely woman in the Seven Kingdoms.