These Are All of the Deaths in "House of the Dragon" Season 1

Harwin and Lyonel die in a fire at Harrenhal (which is famously cursed in the world of "A Song of Ice and Fire," with everyone who holds it eventually dying off). "Fire and Blood" never settles the mystery of how this fire started, but "House of the Dragon" gives us an answer — it was Larys Strong, killing his own kin.