A new Game Of Thrones prequel spin-off series has been announced by HBO.

Set a century before the events of the original Game of Thrones (GoT) series, A Knight Of The Seven Kingdoms: The Hedge Knight, is set to be the latest edition to the popular fantasy franchise. 

The story is made up of the first three official prequel novellas of George RR Martin’s ongoing series A Song Of Ice And Fire.

It tells the story of Ser Duncan the Tall and his squire, Egg, following their exploits in an age when the Iron Throne is still under Targaryen rule.

The novel's logline reads: “Improbable heroes though they be, great destinies lie ahead for Dunk and Egg; as do powerful foes, royal intrigue, and outrageous exploits."

A Knight Of The Seven Kingdoms has received a straight-to-series order from HBO and will stream on Warner Bros newly unveiled service Max.

Martin will serve as the executive producer of the show, alongside Ira Parker, Ryan Condal, and Vince Gerardis.

News of the new prequel series comes following the announcement that production has begun in the UK on the second series of HBO’s previous Game Of Thrones spin-off, House Of The Dragon.

The show is based on Martin’s Fire And Blood, which is set 200 years before the events of GoT, and the new series will see the return of Matt Smith, Emma D’Arcy and Paddy Considine in their starring roles.

It chronicles the beginning of the end of House Targaryen and the events leading up to the Targaryen civil war, known as the Dance of the Dragons.

Ryan Condal, co-creator, showrunner and executive producer, said: “House of the Dragon has returned.

"We are thrilled to be shooting again with members of our original family as well as new talents on both sides of the camera.

“All your favourite characters will soon be conspiring at the council tables, marching with their armies, and riding their dragons into battle.

“We can’t wait to share what we have in store.”

The first series of House Of The Dragon was well-received and was awarded the Golden Globe for best drama television series earlier this year.