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Breton (ˈbɹɛtən , bʁətɔ̃; brezhoneg bʁeˈzɔ̃ːnɛk or brəhɔ̃ˈnek in Morbihan) is a Southwestern Brittonic language of the Celtic language group spoken in Brittany, part of modern-day France. It is the only Celtic language still widely in use on the European mainland, albeit as a member of the insular branch instead of the continental grouping. Breton was brought from Great Britain to Armorica (the ancient name for the coastal region that includes the Brittany peninsula) by migrating Britons during the Early Middle Ages, making it an Insular Celtic language. Breton is most closely related to Cornish, another Southwestern Brittonic language. Welsh and the extinct Cumbric, both Western Brittonic languages, are more distantly related, and the Goidelic languages (Irish, Scottish Gaelic) have a slight connection due to both of their origins being from Insular Celtic. Having declined from more than one million speakers around 1950 to about 200,000 in the first decade of the 21st century, Breton is classified as "severely endangered" by the UNESCO Atlas of the World's Languages in Danger. However, the number of children attending bilingual classes rose 33% between 2006 and 2012 to 14,709. TOC Linguistic boundary of Brittany Breton is spoken in Lower Brittany (Breizh-Izel), roughly to the west of a line linking Plouha (west of Saint-Brieuc) and La Roche-Bernard (east of Vannes). It comes from a Brittonic language community that once extended from Great Britain to Armorica (present-day Brittany) and had even established a toehold in Galicia (in present-day Spain). Old Breton is attested from the 9th century. It was the language of the upper classes until the 12th century, after which it became the language of commoners in Lower Brittany. The nobility, followed by the bourgeoisie, adopted French. The written language of the Duchy of Brittany was Latin, switching to French in the 15th century. There exists a limited tradition of Breton literature. Some philosophical and scientific terms in Modern Breton come from Old Breton.