[Spoilers] Young Ned Stark

They've been more focused on Lyanna this year, but almost every single season has at least one episode that mentions Rhaegar. Quite a few mention Rhaegar in context with Lyanna, the most damning is Oberyn's comments on how Rhaegar dumped Elia for her. Then we have both Bran and Sansa telling us that Rhaegar kidnapped and raped Lyanna, aside from Robert saying that in the very first episode, obviously. And of course there's always mention of Rhaegar within Dany's story line, from both Jorah and Selmy. So, yes, the audience does know who Rhaegar is, so much so that I've got friends who are Unsullied and they believe in RLJ.

Not necessarily. He's not show in the novels either, aside from a drug induced vision of Dany's and a physical description from Cersei. The thing is, unless Robert turns out to be Jon's father, there is no other man on the show ever associated with Lyanna. And there has only been one mention of Arthur Dayne, and that was in the White Book, which gets read aloud in one episode 2 seasons ago, and the physically seeing him die at the ToJ, so it would be a bit out of left field to have him as Jon's father.




You mean the battle against the Others or the battle of Winterfell? I don't see how being the product of Rhaegar and Lyanna would change the outcome of any battle.