Breton /ˈbrɛtən/ (Brezhoneg IPA: [bʁe.ˈzõː.nɛk]) is a Celtic language spoken in Brittany (Breton: Breizh; French: Bretagne), France.Breton is a Brittonic language brought from Great Britain to Armorica by migrating Britons during the Early Middle Ages; it is thus an Insular Celtic language and not closely related to the Gaulish language. Breton is most closely related to Cornish, both being Southwestern Brittonic languages.