All points to Lady Gwynhyfvar, I'm just taking this show on the road. Crazy and probably not true, but color me intrigued. Rhaegar had two squires, Myles Mooton and Richard Lonmouth. They, along with Arthur Dayne, were his closest companions. Myles is explicitly confirmed to be dead, killed by Robert at the Battle of the Bells. With Richard though, there's not word one. We have no idea what happened one way or the other. Lonmouth is interesting because he has the distinction of being ob