George R.R. Martin still knows what he'd call the Game of Thrones prequel, even if HBO officially doesn't. Last week, it seemed the new series — set centuries before the current events in Westeros and co-created by Martin and Jane Goldman (Stardust) — finally had a name we could attach to it.

In discussing the casting of Naomi Watts for the series, Martin seemed to reveal its official title: The Long Night, a reference to the seemingly endless and perilous winter that plagued Westeros back in the Age of Heroes, in the time before the Targaryens and their dragons came to the continent and changed everything. Given what we know about the show's setting, that title would seem appropriate, but apparently HBO didn't agree...at least, not yet.

According to the network, the series is still officially untitled, which suggests that they're either waiting to reveal the name The Long Night (getting logos and other promotional material together, or what have you) or that Martin and Goldman initially called it that and the network is simply not sure if that's what they're sticking with. Either way, Martin took to his "Not a Blog" on Monday to take the blame for letting that title leak out...and to rib HBO just a little bit for pushing back.

"Oh, I should also mention… HBO has informed me that the Jane Goldman pilot is not (yet) titled THE LONG NIGHT," Martin wrote. "That’s is certainly the title I prefer, but for the moment the pilot is still officially UNTITLED. So… mea culpa, mea culpa, mea culpa. Elsewise, the pilot is coming along well, with casting falling into place. I could tell you more, but I am not supposed to."

As Martin mentioned, casting is indeed falling into place on the series, with Naomi Watts and Josh Whitehouse already snagging key roles for the project. As for when we'll actually see it, that's not clear. For now, we still have the final season of Game of Thrones to look forward to next year. We'd guess HBO will be a lot more forthcoming about the prequel once the main saga comes to an end.

What do you think? Should HBO stick with The Long Night?