The Game of Thrones cast is constantly growing, and with Season 4 only a few months away, there's still new and intriguing news to be found.

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As Winter Is Coming points out, actor Grahame Fox is listed to play a character called Kenning on his agent's site. The year listed next to the part is 2013. Since Grahame didn't appear in Game of Thrones Season 3, we assume 2013 is the year he was cast, implying that he'll be in Season 4, which filmed last year.

So, who is Kenning, and what does this casting tell us about the show's story? We can pick up some clues from the A Song of Ice and Fire book series.

Warning: The rest of this article contains spoilers from the A Song of Ice and Fire book series. Click away now if you don't want to know!

In the ASOIAF books, House Kenning is one of the noble houses from the Iron Islands. The only notable character from House Kenning in the books is Ralf Kenning, a captain under the command of Victarion Greyjoy (another character we haven't met on the show yet).

In a Feast for Crows, Ralf is the one who urges Victarion to stake a claim to rule the Iron Islands, and Victorian leaves him in command at Moat Cailin while he goes off to the kingsmoot to try to win the throne.

Then, in A Dance With Dragons, Ralf is injured by a poison arrow while holding Moat Cailin; Theon, under Ramsay Bolton's orders, meets with him to try to get his troops to surrender to the Bolton forces. Theon discovers Ralf is a tortured, dying mess and puts him out of his misery.

So, what does the inclusion of this character in Season 4 mean? It certainly suggests that the writers are pulling a lot from the later books, as we've suspected. Maybe we'll be introduced to Victarion? Or maybe the Kenning character will be repurposed for part of Yara's attempted rescue of her brother, which is a new plot in the show?  

What do you make of this casting news? Let us know in the comments below.

Catch the Game of Thrones Season 4 premiere on Sunday, April 6, 2014 at 9 p.m. ET/PT on HBO.