IIRC,the people he was talking about were from somewhere in France,and were pushed out by the Romans. They the settled in the British Isles,but gradually were pushed out of the Isles proper by population pressure and wars. They wound up in the Faeroe Islands and Orkney Islands,and lived mostly be trading walrus Ivory and other high value items like that,as well as fishing.
They were gradually pushed to the west by the Vikings,and were finally absorbed by the Esquimo tribes. Sorry-can't recall any dates as to their adption of Christianity.
That could put them in the Christian era at least, so that much fits.
>They were gradually pushed to the west by the Vikings,
Hmmm. I didn't realize the Vikings actually "pushed" anyone in front of them. Running to escape, maybe. Interesting thought...
>and were finally absorbed by the Esquimo tribes.
The idea that some Vikings (or their equivalent) mated with early Canadian Indians (900 AD) is an old and accepted one in parts of Canadian Inuit lore. Also used to explain the Blue-Eyed Mandan Indians of Montana, etc......