Game of Thrones season 6: Jon Snow theorists believe Ned Stark's son may have a twin sister

R+L=J+M? (Possible spoilers ahead)

Kit Harington as Jon Snow in the Game of Thrones season 5 finale (HBO)

George RR Martin and the Game of Thrones directors have kept their lips tightly shut over Jon Snows lineage, but some fans believe they know who his parents really are.

The most popular theory currently doing the rounds on the internet is R+L=J. Fans believe that Jon is not actually the bastard son of Ned Stark but in fact the love child of Rhaegar Targaryen and Lyanna Stark, Ned’s sister.

However, a more recent theory currently doing the rounds on the internet is that Jon Snow wasn’t the only child Lyanna had, she actually gave birth to twins.

Jon Snow takes command as the wildings launch a double attack on Castle Black (HBO)

Rumours have been spreading like wild fire that in season 6 there will be a flashback to the Tower of Joy, the place where Ned took Jon from Lyanna. But Redditor Ghostchief stipulates: what if there was also a baby girl in the tower?

“A baby's cry rings out as the septa raises a boy and walks him over to the man and woman. The dialogue swells and clarifies to her voice, "Promise me, Ned.” Her eyes slowly close. Ned begins to sob. He raises his head to sound another high pitch noise coming from the foot of the bed. A baby girl.”

First off, why does this matter? Well, mainly because many believe Jon is the true hero of A Song of Ice and Fire, and will one day become the legendary warrior Azor Ahai. If he has a twin sister, she could possibly take on that mantel, especially considering Jon's recent fate.

Here’s a quick YouTube video to catch you up on all the theories surrounding the warrior.

So if he has a twin sister, who could she be? Luckily a theory has been circulating since before 2012 which believes Meera Reed is Jon's long lost twin.

Meera Reed, Bran and Hodor walk through the snow to find the three-eyed crow (HBO)

So, where’s the evidence? One major factor is that when Ned Stark went to save Lyanna, who was surrounded by Kingsguard, only two men survived: Ned and Howland Reed - Meera’s father. Is it possible Ned gave her to Howland to split the twins up?

Further proof is in their ages: they’re exactly the same. According to this major A Song of Ice and Fire database they were both born 283 AC, the year Lyanna died. BOOM.

You want more proof, I hear you shout. Well, as pointed out by HuffPost, not only do the two look like each other, but there’s also an old Roman myth that tells a very, very similar story.

The story of Romulus and Remus follows two twin brothers, who were the sons of Rhea Silvia, the kings daughter. Before their conception, however, a rival king took power and wanted to kill all who fell into the old kings bloodline.

The twins were soon born after, and left abandoned to die until being luckily saved by a mother wolf until a shepherd fostered them. Eventually they discovered their birth right and overthrew the king to take the throne for themselves.

A rival king taking the throne? Wanting to end a bloodline? WOLVES?!?! There's so much symmetry, is it really just one big coincidence? It's all just a little bit too Star Wars...