Winter is coming--in the form of the Game of Thrones prequel series.


It's been less than a month since the extremely divisive finale of Thrones debuted, and HBO is already looking towards the next chapter in George R.R. Martin's world. The upcoming TV show is set to explore a time thousands of years before the events of GoT, in the Age of Heroes. And now, according to Entertainment Weekly, it has begun filming.


In true Thrones fashion, the as-yet-untitled series is being shot in Northern Ireland, a frequent location for the original show. EW reports that it hasn't been disclosed if other countries will be used for filming as well or not.


While the working title of the series has been reported to be Bloodmoon, the legitimate title has only been teased by Martin. If his claim is true, the prequel will be called The Long Night, referring to the time when darkness fell upon the Known World, lasting for a generation.


"Westeros is a very different place," the acclaimed author previously stated of the prequel series. "There’s no King’s Landing. There’s no Iron Throne. There are no Targaryens — Valyria has hardly begun to rise yet with its dragons and the great empire that it built. We’re dealing with a different and older world and hopefully that will be part of the fun of the series."


Although many fans were not happy with the way Game of Thrones ended, no one can deny being at the very least curious to see what HBO does next with this fantasy world. The prequel will star Naomi Watts, Josh Whitehouse, Naomi Ackie, among others, with showrunners Jane Goldman and Martin himself.