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Spoilers: This is only a theory, so there is no guarantee that this is correct. It also only includes information up to the end of the TV series, though some information used is only present in the books.

Any revelation that a character has Targaryen blood would drastically change what's happening in Westeros. Tap to play GIF Tap to play GIF HBO / Via giphy.com This is primarily because dragons. Though also because the Targaryens are the historical rulers over Westeros.

So what if... TYRION LANNISTER WAS A TARGARYEN? Tap to play GIF Tap to play GIF HBO / Via totalfilm.tumblr.com Some fans came up with this theory based on the books, and it has much more credibility than you might initially expect.

The story goes that King Aerys, father of Daenerys, was infatuated with Tywin's wife, Joanna. Tap to play GIF Tap to play GIF HBO / Via youtube.com At the wedding of Tywin and Joanna, he lamented the lack of first bedding rights traditionally given to the king.

Following on from this, he "took certain liberties" during the bedding ceremony. Some fans believe Aerys, either by seduction or force, continued a relationship with Joanna. Tap to play GIF Tap to play GIF HBO / Via fanpop.com This relationship eventually led to the birth of Tyrion, giving him Targaryen blood, the blood of the dragon.

This betrayal also explains Tywin's violent hatred towards Tyrion, and especially his complaint that "I cannot prove you are not mine". Tap to play GIF Tap to play GIF HBO It gives a clear reason for his refusal to make Tyrion the heir to Casterly Rock, as well as his refusal to give any responsibility to his "son."

Tyrion's personality also shows signs of not being truly Lannister, as he is described as having "a morbid fascination with dragons", and a bookish inclination, much like Rhaegar Targaryen. Tap to play GIF Tap to play GIF HBO / Via nwktomia.com He explains how he dreamt of dragons, which Daenerys is also described as doing, and implies he knows that Jon Snow has dreamt of dragons as well.

The most important reason for this theory is a prophecy given to Daenerys in the House of the Undying: "The dragon has three heads." HBO This therefore requires another Targaryen to fulfill the prophecy, alongside Dany and (possibly) Jon.

Additionally, a dragon must be "born of blood", and Jon, Dany, and Tyrion all had mothers who died giving birth to them. hdhqimg.com

And in the last moments of his life, Tywin says what he has suspected for many years, which fans have interpreted as the final confirmation that Tyrion is not truly a Lannister. Tap to play GIF Tap to play GIF HBO It has also been pointed out that Tyrion is such a major character throughout the series that his eventual importance makes a lot of sense.

And if Tyrion IS indeed a Targaryen, what impact does that have on the rest of the series? It leaves open the option for him to unite with Daenerys, which would be a fascinating alliance. And if Jon is indeed also part Targaryen, it could mean a three-way alliance to bring the Targaryens back to throne. It could also change the order of succession for the Targaryen throne, moving Tyrion after Jon, with Daenerys in third, assuming their nature as bastards is no impediment. Of course, being Westeros, it's most likely that whoever has the biggest army will succeed. Or the most dragons.