The dust has barely settled in King’s Landing but HBO is busy pushing forward with Game Of Thrones prequel plans, with filming for one show beginning in Northern Ireland.

Entertainment Weekly reports that the cast and crew of the currently untitled programme have assembled in the country, which was where production on the main series took place.

The new series has previously been referred to by two separate names, with Bloodmoon used as a working title, while George RR Martin also hinted it could be called The Long Night.

HBO previously announced events will take place “thousands of years” before Game Of Thrones, with a summary that explained: “The series chronicles the world’s descent from the Golden Age of Heroes into its darkest hour.

“From the horrifying secrets of Westeros’ 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.”

The all-star cast will feature Naomi Watts, John Simm, Miranda Richardson. Naomi Ackie (Lady Macbeth), Jamie Campbell Bower, Denise Gough and Richard McCabe (Philip K. Dick’s Electric Dreams), among plenty of others.

Jane Goldman and Thrones author George will be credited as the creators of the show and both will hold executive producer titles too.

It isn’t the only spin-off in the works though, as George previously revealed three others “remain in the script stage but are edging closer”.

Find out more about the other Westeros-related shows in development here.