[X Fretensis]

Perhaps?. The Icelandic sagas “Saga of the Greenlanders” and “Saga of Eric the Red” document “Vinland”. While there are some discrepancies between the two; the accuracy of these sagas was proven when they were used by archeologists to locate the Norse settlement at L’Anse Aux Meadows in Northern Newfoundland. This settlement only lasted about 8-10 years. It’s existence and the Sagas pretty well document the Norse discovery of the Americas 500 years before Columbus. However, I am not aware of any of this information ever being taken back to Europe.

[Verginius Rufus]

Yes, L'Anse aux Meadows is definitely a Norse settlement from about 1000. Whether the Norse went further afield (Nova Scotia or New England) is unknown, but I recall reading that a medieval Norwegian coin (13th century?) was found at an archaeological site in Maine. It could have been traded from one tribe to another so may not mean the Norse got that far but would indicate at least some later contacts after the incidents around 1000 described in the sagas.

About 986 a Norseman attempting to sail from Iceland to Greenland missed Greenland and saw land further west, but did not go ashore. His name was Bjarni (perhaps an ancestor of Bjarni Fife). Leif Ericsson knew about Bjarni's discoveries before the voyage he took which led to the discovery of "Vinland."

I think there is a medieval Danish historian who mentions something about these discoveries but don't remember if he knew about Vinland or only about Greenland.