'While HBO may have canceled Jane Goldman’s Game of Thrones prequel, the network is moving ahead with another spin-off. During Tuesday’s presentation of HBO Max, HBO Programming president Casey Bloys announced a straight-to-series order for House of the Dragon.
The series is based on Fire and Blood, George R.R. Martin’s recently published book about the history of the Targaryen house. Specifically, the show will chronicle the Dance of the Dragons, a.k.a. the civil war between Rhaenyra and Aegon Targaryen for control over the Seven Kingdoms. The war occurred roughly 200 years before the events depicted in Game of Thrones.' - via COS