The Breton Language
From ancient times until the Middle Ages the west of Brittany was a Celtic-dominated region with its own language. Breton Celtic is very similar to the other Celtic laguages such as Irish and Scots Gaelic, Welsh and Cornish but has almost nothing in common with French.
Pre World War I it's estimated that 90% of the western Bretagne population spoke Breton as their first language. Today this figure is probably less than 20% and most of those are over 60 years old.
In the latter half of the 20th century the language seemed doomed to extinction but recently there has been a revival in interest in ensuring that it is not lost.
Schools and adult classes now offer courses and public buildings and services have begun to adopt bi-lingual signage and to produce written materials in both Breton and French.
The pic here is the dual signage at the Roscoff Tourist Office.
For an interesting article on the subject use the link below.