Most of the known recent Celtic languages of the island of Britain form a group known as Brythonic, as far as Wales and western England are concerned, it is fairly safe to assume that the Brythonic-Celtic languages have been in continuous use since Caesar's time. Apart from Welsh, Cornish is the only other living Brythonic language on the British mainland. Cornwall (Kernow) was also known by the Romans as Dumnonia and by the Saxons as the Kingdom of the West Welsh. Cornish (Kernowek) was spoken continuously until 300 years age, from then it declined, and just before the twentieth century it became extinct. The last monoglot Cornish-speaker died in 1676. There is good evidence that Brythonic-Celtic languages, probably southwest Brythonic, were spoken elsewhere in the West Country, in Devon, after the Romans left, the Kingdom of Cornwall persisted during the Dark Ages.
Ymannerch Yr Hob.