Pavane.

Sorry if I was unclear. I did not mean to suggest that Arthur came from Brittany. Documents pertaining to Arthur, however, manifestly have come there. This is because most of the migration to Gaul that created Brittany occurred in the generation or two after Arthur's time (if you believe in Arthur), so stories of Arthur would have been carried there by the migrating Britons/Bretons. If you don't believe in Arthur, then Arthur was already a legendary figure by the time the Breton migrations occurred, so once again stories were carried there.