Olivia Cooke and Ewan Mitchell as Alicent Hightower and Aemond Targaryen in "House of the Dragon." Theo Whitman/HBO In "House of the Dragon," Daeron Targaryen is the youngest son of Alicent and the late King Viserys. Daeron grew up with the Hightowers in Oldtown, rather than in King's Landing with his siblings. He finally makes his debut in "HOTD" season three. Here's what to know about Daeron in the book. Warning: Spoilers ahead for "House of the Dragon" season three, episode three, and for t