Everything in this article is speculation regarding one of the filming locations of season six of Game of Thrones. No actual spoilers, but a major fan theory surrounding the origins of one character so I’m giving a warning anyways.

Pictured above is a 12th century castle known as Castillo De Zafra located in Guadalajara, Spain where at least one scene of season six of Game of Thrones will be filmed. Many think that this location matches the description of the Tower of Joy from the books.

Therefore, fans think that this means we will be seeing the first flash back sequence, especially when combined with the following casting call we got awhile back that many speculated to be for Arthur Dayne:

A man in his thirties or forties who is a great swordsman and a paragon of knighthood. He carries a hugely famous sword on his back. The show is seeking a very impressive swordsman for the role- the best in Europe, for a week of filming fight scenes for a season 6 role. His ethnicity/race isn’t specified, unlike many other roles.

It certainly could fit Arthur Dayne’s description. For those that need a refresher: Arthur Dayne, also known as the Sword of Morning, was one of Mad King Aerys’s Kingsguard and best friends with Prince Rhaegar Targaryen. He wielded a greatsword that legend said was forged from a fallen star, named Dawn.

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When Aerys sent the Lord Commander of the Kingsguard to find Rhaegar after the executions of Brandon and Rikard Stark, Arthur Dayne was among the Kingguard found with Rhaegar at the Tower of Joy located in Dorne. Arthur Dayne stayed at the tower after Rhaegar left and was presumably present when Ned Stark found Lyanna Stark there on her deathbed many months later.

(For more details about the events leading up to the first book, check out this guide I did awhile back.)

In the books the only time we “saw” the Tower itself was a fever dream Ned had while imprisoned in the Red Keep prior to his execution. It was mentioned a few times by other characters, such as Ser Barriston to Dany.

“I looked for you on the Trident,” Ned said to them.

“We were not there,” Ser Gerold answered.

“Woe to the Usurper if we had been,” said Ser Oswell.

“When King’s Landing fell, Ser Jaime slew your king with a golden sword, and I wondered where you were.”

“Far away,” Ser Gerold said, “or Aerys would yet sit the Iron Throne, and our false brother would burn in seven hells.”

“I came down on Storm’s End to lift the siege,” Ned told them, and the Lords Tyrell and Redwyne dipped their banners, and all their knights bent the knee to pledge us fealty. I was certain you would be among them.”

“Our knees do not bend easily,” said Ser Arthur Dayne.

“Ser Willem Darry is fled to Dragonstone, with your queen and Prince Viserys. I thought you might have sailed with him.”

“Ser Willem is a good man and true,” said Ser Oswell.

“But not of the Kingsguard,” Ser Gerold pointed out. “The Kingsguard does not flee.”

“Then or now,” said Ser Arthur. He donned his helm. “We swore a vow,” explained old Ser Gerold.

Ned’s wraiths moved up beside him, with shadow swords in hand. They were seven against three.

“And now it begins,” said Ser Arthur Dayne, the Sword of the Morning. He unsheathed Dawn and held it with both hands. The blade was pale as milkglass, alive with light.

“No,” Ned said with sadness in his voice. “Now it ends.”

The obvious question though, if this is the Tower of Joy, is through whose perspective are we seeing this event? All the characters who were present are dead save for Howland Reed, who we have yet to see in the show. There are no weir trees that we know of present in Dorne either. So how are they going to include this event when what exactly happened was always unclear in the book and told second- and third-hand?