Every Game of Thrones fan out there knows that the relationship between Jon Snow and Daenerys Targaryen won't end well.

For starters: they're related. What's more: they're fighting a war, and people die in war. Another thing? Jon Snow could end up killing Daenerys.

Wait...what? In case you're not clued up on the last point yet, a popular fan theory online claims that the King in the North will slay his lover - and auntie - due to an ancient prophecy.

Could this heartbreaking hypothesis be the one to prevail? Well, let's dive deeper into it and you can make your own mind up.

The theory is based on the assumption that Jon is the Prince that was Promised, Azor Ahai.

Azor Ahai was a legendary saviour of the Seven Kingdoms, the man who saved Westeros from the White Walkers during the Long Night thousands of years ago. While he has only been mentioned briefly on the TV show, fans of the books will recognise that his presence in the A Song of Ice and Fire book series is prevalent.

The Prince that was Promised prophecy predicts that Azor Ahai will be reborn to defeat the White Walkers when they return - and, unsurprisingly, Jon Snow is the prime candidate for this, given that he was reborn after his death in the Season five finale.

Sadly though, it's not all glory for the prince, who is often referred to by the Red Witch, Melissandre. In order to fight the White Walkers, the legendary hero wielded a burning sword called the Lightbarer; to make such a weapon, he sacrificed his lover, Nissa Nissa.

If you've watched the season seven finale, you'll know that Jon's lover is none other than Mother of Dragons, Daenerys Targaryen. Will history repeat itself?

The theory that Jon will eventually come to kill Khalessi has been extensively discussed on Reddit, with one user named  u/jman797 recently writing:

"So most people think Jon Snow/ you know what is Azor Ahai, right? ‘The first sword Azor Ahai forged was plunged into water. The second was plunged into the heart of a lion. The third was plunged into the heart of his wife. Dany and Jon obviously love each other, given that scene in 7-6, so I think it’s possible that if Jon truly is Azor Ahai reborn, well…. I damn well hope there’s no marriage in store for him."

They continued:

"One reason I think this will happen is because he’s confirmed Rhaegar’s son, so Dany is not Queen. If he married her, and killed her like the first Azor Ahai, it clears the way for: A: The true king of Westeros, by birth at least. B: Azor Ahai, the one foretold in the prophecy of Fire and Ice. ‘I dunno if it’ll happen, and maybe it won’t, but by god Jon better not forge any sword any time soon."

While some users of the site agreed with the controversial theory, others weren't so sure. One Redditor named rivenwald insisted that the story was designed to show that the characters cannot give up, writing: "I think the whole purpose of the Nissa Nissa story was to show that nothing is easy and with responsibility comes sacrifice So it might just mean that they will have to try and try again to defeat the night king until they figure it out".

Others insisted that Jon wasn't the only candidate for Azor Ahai, with Reniboy writing:  "I am actually convinced that Azor Ahai is actually Rhaegar Targaryen and Jon Snow is Lightbringer" and 19tx99 arguing "I think it's more likely for Jaime to be AA than Jon."

So, who's right? Who's way off? We'll find out next year...

Every Game of Thrones fan out there knows that the relationship between Jon Snow and Daenerys Targaryen won't end well.

For starters: they're related. What's more: they're fighting a war, and people die in war. Another thing? Jon Snow could end up killing Daenerys.

Wait...what? In case you're not clued up on the last point yet, a popular fan theory online claims that the King in the North will slay his lover - and auntie - due to an ancient prophecy.

Could this heartbreaking hypothesis be the one to prevail? Well, let's dive deeper into it and you can make your own mind up.

The theory is based on the assumption that Jon is the Prince that was Promised, Azor Ahai.

Azor Ahai was a legendary saviour of the Seven Kingdoms, the man who saved Westeros from the White Walkers during the Long Night thousands of years ago. While he has only been mentioned briefly on the TV show, fans of the books will recognise that his presence in the A Song of Ice and Fire book series is prevalent.

The Prince that was Promised prophecy predicts that Azor Ahai will be reborn to defeat the White Walkers when they return - and, unsurprisingly, Jon Snow is the prime candidate for this, given that he was reborn after his death in the Season five finale.

Sadly though, it's not all glory for the prince, who is often referred to by the Red Witch, Melissandre. In order to fight the White Walkers, the legendary hero wielded a burning sword called the Lightbarer; to make such a weapon, he sacrificed his lover, Nissa Nissa.

If you've watched the season seven finale, you'll know that Jon's lover is none other than Mother of Dragons, Daenerys Targaryen. Will history repeat itself?

The theory that Jon will eventually come to kill Khalessi has been extensively discussed on Reddit, with one user named  u/jman797 recently writing:

"So most people think Jon Snow/ you know what is Azor Ahai, right? ‘The first sword Azor Ahai forged was plunged into water. The second was plunged into the heart of a lion. The third was plunged into the heart of his wife. Dany and Jon obviously love each other, given that scene in 7-6, so I think it’s possible that if Jon truly is Azor Ahai reborn, well…. I damn well hope there’s no marriage in store for him."

They continued:

"One reason I think this will happen is because he’s confirmed Rhaegar’s son, so Dany is not Queen. If he married her, and killed her like the first Azor Ahai, it clears the way for: A: The true king of Westeros, by birth at least. B: Azor Ahai, the one foretold in the prophecy of Fire and Ice. ‘I dunno if it’ll happen, and maybe it won’t, but by god Jon better not forge any sword any time soon."

While some users of the site agreed with the controversial theory, others weren't so sure. One Redditor named rivenwald insisted that the story was designed to show that the characters cannot give up, writing: "I think the whole purpose of the Nissa Nissa story was to show that nothing is easy and with responsibility comes sacrifice So it might just mean that they will have to try and try again to defeat the night king until they figure it out".

Others insisted that Jon wasn't the only candidate for Azor Ahai, with Reniboy writing:  "I am actually convinced that Azor Ahai is actually Rhaegar Targaryen and Jon Snow is Lightbringer" and 19tx99 arguing "I think it's more likely for Jaime to be AA than Jon."

So, who's right? Who's way off? We'll find out next year...