The Use of French in Medieval Brittany

The interests of England and Brittany were closely interwoven in the
later middle ages, and Brittany's history during this time is most
fascinating. Right now, my main research interest is in the reign of
Edward III, who played a large part in the Breton War of Succession. But
Ricardians are also familiar with England's Breton links. I came across
this link which might be of interest to people researching both the
Hundred Years' War and the Yorkist connection with Brittany

The Use of French in Medieval Brittany
http://elec.enc.sorbonne.fr/document188.html