Originally Posted by Unknown Soldier

This is really interesting stuff and wasn't aware of any of it. The only issue here though, is that in the TV series Jon Stark doesn't remotely look like a Targayen (not sure without looking back about his description in the first book what his description should be) I mention this, because of the issues with Cersei's children and their physical appearances. Also with Ned Stark having died, he was probably the only one who could give any truth to this theory, unless any remaining Kingsguard's had any knowledge.