Example image of eyePlorer eyePlorer map for 'Brythonic languages': Goidelic languages Insular Celtic languages Anglo-Saxons Britons (historical) Celtic studies Gaels John Rhys Wales Welsh language British Isles British Iron Age British language (Celtic) Firth of Forth Roman Britain Pictish language Brittany Breton language Cornish language Cumbric language English language Isle of Man England France Welsh Argentine Celtic languages Gaulish language Hypothesis P-Celtic and Q-Celtic Sound change Proto-Southwestern Brythonic Western Brythonic Indo-European languages Kenneth H. Jackson 6th century BC Proto-Celtic Mario Alinei 1st century BC Germanic languages Stephen Oppenheimer Great Britain Manx language River Clyde River Forth Pritennic Ireland Southern France East of England Armorica 7th century 5th century