House of the Dragon season 1, episode 1 "The Heirs of the Dragon," shows a Hightower named Otto occupying the most important seat at King Viserys' small council. He's served Viserys' grandsire, Jaehaerys as Hand, and now advises his grandson on almost every subject under the sun. Otto Hightower's only daughter, Alicent also lives in King's Landing with him, and she's best friends with the king's daughter. The young women are a terrific duo, and their fathers are the first and second most powerful men in the Seven Kingdoms.