Winter is coming — as is anotherGame of Thronesprequel series.

Deadlinereported on Thursday that HBO is close to finalizing a deal for aGame of Thronesprequel set 300 years before the events of the award-winning series and will focus on the beginning of the end for House Targaryen.

George R.R. Martin,A Song of Ice and Fireauthor and co-executive producer of the original series, and Ryan Condal (Colony) will reportedly serve as the show’s writers and creators. The prequel will be largely based on one of Martin’s books,Fire & Blood.

HBO declined a request for comment from PEOPLE.

Along with the potential Targaryen-centric series, three otherGoTprequels have moved forward in development at HBO.

The untitled prequel that is furthest along in production, which set to take place roughly 5,000 years before the events of the HBO series,finished filmingthe pilot episode in Northern Ireland this summer.

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“The shooting has wrapped, it looks really good, the cast was amazing,” said President of HBO Programming Casey Bloys at the HBO TCA press tour in July.

Bloys added that the pilot is currently in the edit bay, and while he has not seen the finished cut, he said they are “looking forward” to seeing what comes of it.

In a previous interview withEntertainment Weekly, Martin, 70, revealed that the fan-favorite Stark family woulddefinitely be aroundin the prequel series. However, that can’t be said for the villainous Lannisters.

Maisie Williams, Isaac Hempstead Wright, and Sophie Turner.Macall B. Polay/HBO

Game of Thrones

The prequel also predates dragons, unfortunately — but don’t despair, because Martin promises other creatures will be featured.

“Obviously the White Walkers are here — or as they’re called in my books, The Others — and that will be an aspect of it,” Martin said. “There are things like direwolves and mammoths.”

As previously announced, the prequel will star Oscar nomineeNaomi Watts(King Kong), Naomi Ackie (Lady Macbeth) and Denise Gough (Broadway’sAngels in America).

Martin and Jane Goldman (X-Men: First Class,Kingsman: The Secret Service,Kick-Ass) are the creators of the new series, with Goldman serving as the showrunner. (Damon Benioff and D.B. Weiss, the showrunners of the original series, will not be involved.)

source: people.com