I guess it is a freak incident that just happens sometimes. All i can say is that Ashara Dayne is described as having purple eyes. And that is it. Boy, has people spent much time procrastinating over what Howland Reed knows, or not knows. Please continue.... You seem to have listed all the mayor clues that point towards the Rheagar+Lyanna=Jon (R+L=J) theory. There are others, but you seem to have found the big ones. I think it is very possible that Lyanna got Ned to promise, to keep the boys identity secret. "Promise me Ned". From what we saw with the Viserys and Daenerys issue, Robert would go to pretty extreme measures to get rid of any "Dragon spawn". It is true that Roberts hatred for Targaryens only started after Rheagar disappeared with Lyanna, so Lyanna couldn´t have known about it. But Robert was Lyannas fiancé, and she seems to know him pretty well. Her´s one of her great lines: "Love is sweet Ned. But Robert will never keep to just one bed." She must atleast have known Robert could get angry, and perhaps hurt the child.