Eastern Brythonic was the dialect of the BritishCeltic language spoken in most of England. Eastern Brythonic was spoken in all of England apart from Northwest England, the Welsh marches and South west England. It is likely the Eastern Brythonic dialect died out during the 7th Century although some isolated pockets (for example in the Fens and the Chiltern Hills) could have survived well in to the 8th Century. In Northwest England and the Welsh marches a dialect called Western Brythonic was spoken, which evolved into Welsh and the now extinct language of Cumbric. In south west England a dialect called Southwestern Brythonic was spoken. This evolved into Cornish and Breton.