Piecing together everything from the five books, it makes the most sense honestly. Everyone says clearly that Ned was too honorable to sire a bastard, and Rhaeger was known to be an honorable man but one who kidnapped Lyanna? She was stubborn and aggressive, she did what she wanted, and she didn't want Robert the way he wanted her. She says "promise me Ned" on a bed of blood, could mean she's dying and asks him to protect her baby. That way Robert wouldn't freak out and kill him.
Homeowners insurance doesn't cover floods unless you specifically ask/pay for it... which you would think falls under 'act of god' but it doesn't. The insurance does cover tornados as an 'act of god'... so figure that one out.
Uh, my question is, if all that is true...then how the hell will they prove it? The only people who knew about it - Rhaegar, Lyanna and Ned - are all dead. They won't be telling anyone anytime soon. Ned refused to even tell his wife the truth, and when you think about it, it would have saved Jon Snow a LOT of grief as a kid if he had, since Catelyn wouldn't have seen him as a threat to her blood. So Ned refused to breathe a word to a goddamn soul.
(FOOLS, DO NOT READ THIS NEXT PART OR IT'LL SPOIL PARTS OF THE NEXT BOOKS)
The only way I think that truth, if truth it is, could come out is if Jon Connington somehow knows the truth, and lives long enough to come across Jon. But the way things are playing out, especially since Jon Snow is dead now too, how's that going to come out?
The only other person who knows of Lyanna's promise to Ned was Howland Reed, Jojen and Meera's father. I guess if Jon, or possibley Bran, runs into Reed, then we might find out what Lyanna's promise was.
The other Jon might know and like Lemmy says there's at least one other person who knows. If this theory is true, and it makes a good theory, there will be at least someone in the books who knows and will reveal it in time. A lot of people theorize this means Jon could be a candidate to marry Dany when she comes back to power since that family prefers to breed in the blood ... probably not a good idea since it made Aerys.
I have a love/hate relationship with it. I love it so much but every episode is over before I even realize it and I practically have to pour salt in my eyes to keep from reading what happens next. That and Peter Dinklage never being on screen long enough. To hell with Stannis and Jon, MORE TYRION.
It really does make the most sense doesn't it and obviously Robert had no idea as he mentioned to Ned about Jon's mother more than once, how he stepped out and to not blame himself as it was a time of war and all. I can't remember how long they said Lyanna was in the Tower but bed of blood? yeaaah going to say childbirth...