This article contains FULL SPOILERS for House of the Dragon season 3, episode 8, "The Treasons at Tumbleton." Gayle Rankin's Alys Rivers has been one of House of the Dragon's most enigmatic figures since her introduction in season 2. Gayle Rankin (Alys Rivers) and Ewan Mitchell (Aemond Targaryen) in House of the Dragon season 3. Ewan Mitchell (Aemond Targaryen) and Gayle Rankin (Alys Rivers) in House of the Dragon season 3. House of the Dragon season 3 is streaming now on HBO Max.