Game of Thrones prequel series, House of the Dragon, is still targeting a 2022 release date, according to HBO president Casey Bloys. He also confirmed that casting for the series is underway, though no additional specifics were given about exactly where the series is in the casting process.
Set 300 years before the events of Game of Thrones, House of the Dragon tells the story of House Targaryen. The spinoff was given a series order back in 2019. HBO ordered House of the Dragon straight to series for 10 episodes in October 2019. George R.R. Martin, Vince Gerardis, Ryan Condal, and Miguel Sapochnik are executive producers, with Condal and Sapochnik also serving as showrunners.
A rumor late last month revealed that the series is looking to cast at least one very significant Targaryen, Daemon Targaryen, “the rogue prince,” also known as “Lord Flea Bottom”. Daemon was the adventurous brother of King Viserys I, the king whose progeny would fight over control of the Iron Throne in the civil war known in Westerosi history as “The Dance with Dragons.” Daemon’s relationship with his brother is the subject of George R.R. Martin’s novelette, The Rogue Prince.