This 'Game of Thrones' casting news could hint at a Season 8 storyline

Warning: Contains spoilers for Game of Thrones Season 7.

It may be many long and dismal months before the Game of Thrones finale arrives, but when it comes to Westeros it's never too early to start speculating.

The latest Season 8 clues come courtesy of fan site Watchers on the Wall, who have done a splendid bit of detective work to track down a new -- and potentially important -- addition to the cast.

That addition is a character called Sarra, who will be played by an actress called Danielle Galligan.

Look at the latest listing on Galligan's talent management profile:

Original image has been replaced. Credit: Mashable

Yep: Game of Thrones Season 8, directed by David Nutter (who's previously directed a bunch of Thrones eps), playing the part of Sarra.

Obviously this isn't official, HBO-certified confirmation she's going to be in Thrones, but given that it's on Galligan's official acting profile it's unlikely to be made up -- plus Galligan shared an Instagram photo of herself in Belfast recently, with a caption that suggested she'd just finished filming something.

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So who is Sarra?

There aren't many (living) characters called Sarra in the world of Westeros, but there is one: Sarra Frey, granddaughter of Walder Frey and one of the girls Robb Stark had the option of marrying back before it all went horribly wrong for him.

The character has previously appeared in the show (she's briefly in "The Rains of Castamere" episode, which interestingly was also directed by Nutter), but since the Red Wedding there's been no sign of her.

Now that Arya Stark has dispensed with pretty much all of the Frey men, though, that could all be about to change.

Maybe Sarra will rally alongside the remaining Frey women and commit herself to the Stark cause in Season 8?

Only time will tell...