As reported last month, Game of Thrones will be filming at the Castillo de Zafra in Campillo de Dueñas, Spain, on September 28, 29 and 30th.

The stone-bedded castle, located in the Sierra de Caldereros in Guadalajara province, was unofficially confirmed as the Tower of Joy a while back, and we also received more details at that time of the Legendary Swordfighter character presumed to be Ser Arthur Dayne.

LaVanguardia reports that it’s “estimated to be around 200 people” arriving with trucks and trailers to film September 28th-30th. They say that the castle’s owner, Daniel Sanz, informs them that Game of Thrones has permission to shoot both inside and outside the castle, but that he doesn’t know the planned details of the shooting, only the dates.

The casting breakdown for the Dayne character stated he would be filming in Northern Ireland, indicating studio filming. It’s not known if his stunt double (mentioned in the writeup) will also solely be shooting in N.I. or if we can expect a stunt fighter to turn up for filming at the Castillo de Zafra at the end of September.

The potential significance of the Tower of Joy is not lost on any reader of the A Song of Ice and Fire novels. The events that took place at the tower (and the ones hinted at) form the heart of many major fan theories.

Given how isolated the Castillo de Zafra is, though, it will be very difficult for anyone to find out what’s happening at the castle before Game of Thrones wants us to.

Filming news elsewhere: Saintfield, Northern Ireland continues to be a busy hub of activity, though production manages to keep most of it under wraps. One fan spotted this sign yesterday:

@WatchersOTWall signs all over #saintfield but can't get close to the site. Too many tall hedges. pic.twitter.com/UgxWembZkO — Logan Brown (@loganbrownmedia) September 17, 2015

MAJOR SPOILERS

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If you recall, Saintfield is where Game of Thrones is filming a massive battle sequence between the Boltons and the wildlings. Our sources say ultimately several armies are involved with this epic battle, and that this week Kit Harington and Iwan Rheon are back on set.

We’ve also heard Game of Thrones is expected to be working in this part of Saintfield throughout September and into the first couple weeks of October. With a shooting period this long, this battle may outdo anything we’ve ever seen on Game of Thrones.