Filming has kicked off on the Game Of Thrones prequel series, provisionally titled The Long Night, which has been created by Jane Goldman and George R.R. Martin. Here’s everything you need to know about the pilot episode…

Entertainment Weekly reports that filming has begun on the spinoff show, with the outlet stating this: “The shooting location is a familiar one: Northern Ireland, which served as the production of hub for GoT during its entire run. It’s not yet clear if the prequel will also shoot in other countries as well.”

It’s just a pilot episode being shot, for now, with a cast that includes Naomi Watts, Naomi Ackie, Denise Gough, Miranda Richardson, Josh Whitehouse, Jamie Campbell Bower, Sheila Atim, Ivanno Jeremiah, Alex Sharp and Toby Regbo. Jane Goldman is the showrunner.

“Taking place thousands of years before the events of Game of Thrones, the series chronicles the world’s descent from the golden Age of Heroes into its darkest hour,” HBO’s official description of the show tells us. “From the horrifying secrets of Westeros’s history to the true origin of the White Walkers, the mysteries of the East to the Starks of legend, only one thing is for sure: It’s not the story we think we know.”

As we hear more about this prequel show’s development, we’ll be sure to let you know.