HBO has officially ordered a Game of Thrones prequel that will be set thousands of years before the events of the current show. The Game of Thrones prequel was created by Jane Goldman (Kick-AssKingsman: The Secret Service) and author George R.R. Martin (A Song of Ice and Fire).

The channel teased the new series with the following logline: “Only one thing is for sure: from the horrifying secrets of Westeros’ history to the true origin of the White Walkers, the mysteries of the East to the Starks of legend — it’s not the story we think we know.”

The Game of Thrones prequel pilot is based on a story from Goldman and Martin, with a teleplay credited to Goldman, who will serve as the showrunner. Goldman and Martin will also serve as executive producers, along with Game of Thrones producer Vince Gerardis and Daniel Zelman (Damages, Bloodline).

The show is the first of five potential series to move forward at HBO. HBO is also working with Max Borenstein (Kong: Skull Island), Brian Helgeland (Legend), Carly Wray (Westworld), and Bryan Cogman (Game of Thrones) on four other possible shows.

The Goldman and Martin Game of Thrones prequel is not expected to air until at least a year after the final season of the current series.

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