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

Lord Lyman Beesbury (Bill Paterson) is King Viserys's Master of Coin, and in episode nine, he's the only member of the small council to speak up when it's revealed that Aegon (Tom Glynn-Carney) will be named king over Rhaenyra. But he pays for his words very quickly when Ser Criston kills him, smashing his head in. He's the first death in the Dance of Dragons, but certainly not the last.