HBO’s road to more Game of Thrones shows wasn’t smooth. The initial attempted prequel series, Bloodmoon, starred Naomi Watts and was set over 1000 years before the events of GoT, but the show was scrapped after filming a $30 million pilot episode. Subsequently, House of the Dragon inspired more confidence and filmed a full season before the premiere ratings quickly proved that the Targaryens could hold their own. That series is based upon George R.R. Martin’s Fire and Blood, which began 300 years before the events of GoT.