In the history of Westeros, Aegon II served as the King (contested) before Aemond ascended as Prince Regent and Protector of the Realm. His only challenger was his older half-sister, Rhaenyra Targaryen. Aegon II's legitimacy rested on his dragon, Sunfyre, the Conqueror's Valyrian steel sword Blackfyre, the Valyrian steel dagger (which Aemond stole from him), and the Conqueror's crown. The second season of the Game of Thrones spinoff House of the Dragon has infamously strayed away from the source material, with one such deviation being the apparent death of the dragon Sunfyre.