By House of the Dragon season 1, episode 10 "The Black Queen," Ewan Mitchell's Aemond Targaryen devolves into the show's finest villain backed by a compelling backstory. Aemond Targaryen makes his first appearance in House of the Dragon season 1, episode 6 "The Princess and the Queen." He is the secondborn son of Alicent Hightower and King Viserys I Targaryen, and overall, their third and final child, per the show's canon.