I know! they were skilled seafarers, traders, farmers, merchants, mercenaries, explorers - explorers that in all likelihood explored the vast majority of the eastern US/Canada/Canadian arctic, travelled from the norse lands far into central asia, north africa, and all throughout europe.
Further investigation to be done. It could predate Viking visits to Canada by a long time!
i've always been of the mind that early people travelled far more then we give them credit for. there have always been young men(and women too) who want to know what's over the horizon