After seven long seasons, it was confirmed that Ned’s sister is Jon Snow’s mom, who secretly married Rhaegar Targaryen. Ned covered it up so his buddy and liege, Robert Baratheon, who was obsessed with Lyanna, wouldn’t kill the child. Ned took Jon back to Winterfell to raise him as his bastard much to the hatred of his wife, Catelyn.
If Rhaegar and Lyanna are Jon’s parents, the resurrected Jon is not only legitimate, he’s got some regal blood running through his reanimated veins. As he kicks rocks on the Night’s Watch, one can only hope he’ll make his way to Dany and Tyrion (who are probably his relatives) and ride Rhaegal, the dragon named after his possible pops.
Which of these Lyanna Stark theories makes the most sense? Ponder some popular Lyanna Stark-y fan theories - perhaps they'll inspire a theory of your own!
Lyanna Was Much More Than a Love Interest for Robert or Rhaegar
Fans think there was way more substance to Lyanna and that she wasn’t in love with Rhaegar, or anyone for that matter. She had a future as a leader and circumstances beyond her control - or fate - killed that future.
Lyanna’s Story Mirrors the Celtic Goddess Rhiannon
That's probably where the parallels end. Fun coincidence, though: in the Rhiannon legend, the kid disappears while in the care of his six sleepy maids, while in GoT Ned rides with six companions to the Tower of Joy. Rhiannon also wakes up in a pool of blood (from a slain puppy), while Lyanna lies in a pool of her own blood (presumably). Rhiannon is also often associated with Epona, which, you guessed it, is a Roman divinity associated with horses and/or a horse in Ocarina of Time. It would then completely make sense for the show to emphasize Lyanna's abilities on a horse ('stop showing off!’).”
L+R = J: A Fan's Take
If the Starks Are the Seven, Is Lyanna the Mother of the True God?
She also explains that fate has splintered and twisted back on the Starks. We see Ned caught in the snare surrounding the Iron Throne and ultimately beheaded. But was the fate of the Starks set off by Lyanna’s willing or unwilling coupling with Rhaegar? Is there something to the mixing of those bloodlines? Or does her presumed son, Jon Snow, embody ALL of the aspects of the Seven and is the true god/savior of this world? Maybe. Or maybe not. Tormund may disagree that Jon is a god, but just maybe he is, no matter the size of his package. Only time and George R.R. Martin will tell.