Spoiler Warning: This post contains spoilers for all broadcast seasons of HBO's Game of Thrones, all published volumes of A Song of Ice and Fire, references to interviews, set reports, informed by wild speculation, and both fire and greenseer visions.
Did you know that there are secret Targaryens in A Song of Ice and Fire and HBO's Game of the Thrones? Well, officially there is one secret Targaryen, young Aegon, who has only shown up in George R. R. Martin's most recent novel, A Dance of Dragons but there is widespread doubt about his legitimacy. The idea of secret Targaryens in the story is wrapped up in a couple of prophecies, both the foretelling of the "Prince Who Was Promised," which may or may not be related to the return of the mythical hero Azor Azai and also Rhaegar Targaryen's elaboration on that prophecy that the "dragon will have three heads." These are widely thought to mean that the end of the story will involve three Targaryens, one for each of Dany's dragons and that the Targaryen trinity will be involved in the climactic battle against The Others.
So who are these three Targaryens? Clearly, Dany is one of them. The books would have you believe that this new Aegon Targaryen is one also but there is good reason to believe that he is an impostor propped up by Varys and Illyrio as part of their conspiracy to restore the Targaryens and competent leadership to the throne with an "even better than the real thing" impostor. So, it is likely he is the "Mummer's dragon" about which Dany was warned.
For reasons that I have previously described, I believe Jon Snow is the son of Rhaegar Targaryen and Lyanna Stark. Given this fact, and his importance to the story, I believe that he is the second dragon. So, who is the third?
The popular guess is that Tyrion Lannister is, in fact, the third dragon in this scenario. This is based mostly on sketchy book information such as his fascination with dragons, his light blond hair, and eye color. Of course, Tyrion, is perhaps the most beloved character on in the series and with Dany and Jon, part of a trio of protagonists so it is natural to want to see them all ride dragons together into the sunset but this feels like wishful thinking to me. Tyrion as a Targaryen would be a cheap twist that would undermine a lot of what has made the character compelling, namely his relationship to his house and father.
The only solid evidence from which this theory is drawn actually supports another character, or pair of characters. In the books it is relayed through that incorrigible old gossip, Barristan Selmy that the mad king Aerys Targaryen was taken with Tywin Lannister's wife, Joanna, (the mother of Jamie, Cercei, and Tyrion) and even "took liberties with her" on her wedding night. Some have speculated a long-standing affair in support of their Tyrion Targaryen theory but we just don't know. All we do know is of one incident on Tywin and Joanna's wedding night. It would seem then that it would be more likely that the twins would be secret Targaryens than Tyrion. Beyond the "evidence," from a character and narrative point of view, this would be a much stronger and more dramatic choice.
For Tywin, it would explain a lot of his actions and attitudes toward the Mad King, which we pick up in bits and pieces throughout the books. The two had once been close but seemed to have a complicated, antagonistic relationship later in life. According to the books, their conflicts were largely attributed to power struggles over Jamie and Cercei's roles at court. Not only did Arys refuse to marry Cercei to his son, Rhaegar but he drafted Jamie into the King's Guard essentially stealing him away from Tywin and denying the Lannister patriarch his chosen heir. Ultimately, it was Tywin Lannister's actions at the end of Robert's Rebellion that led to the Mad King's death at Jamie's hand. It's not hard to imagine Tywin arranging things so that Aerys would be killed by his own son as a final response to the Mad King's initial insult of fathering a child on his wife. This would be the Tywin Lannister version of a mic drop.
If Jamie and Cercei are not Tywin's children (although still Lannisters though their mother) then Tywin's only true born son would be Tyrion. This explains some Tywin's frustration and anger with his children. Of the three, the only one that is his trueborn is (in his eyes) unfit to be his heir because he is a dwarf. Being Tywin, he is forced to put on a good face and present them as his own children. Instead of undermining the Tyrion/Tywin relationship, this choice would actually enrich it with depth and dramatic irony.
Throughout the books, characters comment on how much Tyrion resembles his father in skill and intellect. His aunt, Genna, even goes as far as to point out to Jamie that Tyrion is Tywin's "true son." In an offhand way, Tywin comments on his children's parentage on a couple of memorable occasions. He grudgingly tells Tyrion that he "cannot prove" that Tyrion is not his son. On the surface, this simply means that as much as he would like it not to be the case, Tyrion is trueborn son. It is interesting that this is something that he would even say. Can he prove that his other children are not his own? Tywin's famous last words to Tyrion, "You're no son of mine" are often interpreted as a confession that Tywin is not actually Tyrion's father but these words take on more power if Tyrion is Tywin's only trueborn son.
For Jamie, in particular, this theory changes things. He would have unknowingly killed his own father. He and Tyrion would have that experience in common. He becomes Kinslayer as well and Kingslayer and his story takes on a new depth. He and Cercei already share some Targaryen qualities such as a penchant for arrogance, incest, and madness. Certainly, Joffrey would have fit right in with Aerys and the worst of the Targaryens.
This also means that for all of Robert's efforts to destroy the Targaryen line, there was one sleeping next to him every night, and Targaryens would sit on the Iron Throne after his death. It also means that Cercei and Dany-two women who seem to be on a collision course in the story-are actually sisters. Much more than the Tyrion as a Targaryen theorgy, the Targaryen Twins theory, infuse Martin's work with a sense of the epic old-school Tragedy that is already part of the eclectic mix of ingredients that make up A Song of Ice and Fire and Game of Thrones.







