George R.R. Martin confirms 'Game of Thrones' spin-off title

Earlier this week, Naomi Watts was confirmed as the first big name attached to the upcoming series, which will be a prequel to the existing show.

'Game of Thrones' author George RR Martin (left). Picture: AFP

LONDON - George R.R. Martin has confirmed the upcoming _Game of Thrones _spin-off show - which will star Naomi Watts - will be titled The Long Night.

The 70-year-old writer penned the A Song of Ice and Fire book series that the HBO fantasy show is based on, and has revealed in a casting announcement that the first of the proposed spin-off projects is set to be titled The Long Night.

Earlier this week, Watts was confirmed as the first big name attached to the upcoming series - which will be a prequel to the existing show - and Martin tweeted the news on Tuesday night.

He wrote: "Casting is now underway for THE LONG NIGHT, the first of the GAME OF THRONES successor series to ordered to film. HBO has just announced the first cast member: NAOMI WATTS is coming on board as one of our stars. (sic)"

The main series of Game of Thrones is set to come to an end when its eighth and final season airs next year, and _The Long Night _is one of a reported five spin-off projects currently in development at HBO.

In a recent blog post, Martin added: "Meanwhile, there are still a couple of other possible prequels in active development. I can't tell you the subject matter of those projects, no, sorry, wish I could. The readers among you might want to grab a copy of FIRE & BLOOD when it is released on November 20, though. (sic)"

Meanwhile, Watts (50) was revealed to have landed one of the leading roles in _The Long Night _by Variety magazine earlier this week.

Whilst her exact character details are being kept under wraps, the publication does report she'll be playing "a charismatic socialite hiding a dark secret."

Variety also reports the show, on the whole, will "chronicle the world's descent from the Golden Age of Heroes into its darkest hour. And 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."