The "Game of Thrones" spinoff will begin filming in the fall.

Deadline reported the prequel pilot will start production in Belfast, Northern Ireland, in October after getting the greenlight at HBO.

The spinoff, which has a tentative title of "The Long Night," will film at The Paint Hall at Titanic Studios, according to the Belfast Telegraph.

HBO has previously used the studio to film "Game of Thrones."

"Game of Thrones" is based on George R.R. Martin's "A Song of Ice and Fire" book series, and will return for an eighth and final season on HBO in 2019.

HBO ordered a pilot for a prequel series in June.

"Yes, it is true, after more than a year of development, HBO has greenlit the first of the 'Game of Thrones' successor shows that we've been working on," Martin confirmed in a blog post.

Martin said "The Long Night" will take place 10,000 years before the events of "Game of Thrones."

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"Kingsman: The Secret Service" screenwriter Jane Goldman penned the pilot script and will serve as showrunner.

"Yes, this is a prequel, not a sequel," Martin added. "None of the characters or actors from 'Game of Thrones' will appear in the new show."

Photo credit: Game of Thrones/HBO