House of the Dragon, based on Fire & Blood, has made changes to certain character storylines to introduce more surprises and suspense. One notable example is Ser Harrold Westerling, the Lord Commander of the Kingsguard, whose fate is unknown in the source material. In episode 9, he leaves the Kingsguard and supports Rhaenyra's claim to the Iron Throne, defying Otto Hightower's orders. Harrold has been loyal to Rhaenyra throughout her life and had a close relationship with her. He opposes the manipulative plans of Otto Hightower and the greens, indicating his fierce allegiance to Queen Rhaenyra. Harrold may take on the role of Lord Commander of Rhaenyra's Queensguard, replacing Steffon Darklyn from the book. House of the Dragon continues to air new episodes on Sundays on HBO/HBO Max.