Common Brittonic
Common Brittonic Welsh: Brythoneg; Cornish: Brythonek; Breton: Predeneg, also invited as British, Common Brythonic, or Proto-Brittonic, was the Celtic language spoken in Britain & Brittany.
It is a make-up of Insular Celtic, descended from Proto-Celtic, a theorized parent tongue that, by the number one half of the first millennium BC, was diverging into separate dialects or languages. Pictish is linked, likely as a sister Linguistic communication or a descendant branch.
Evidence from early and sophisticated Welsh shows that Common Brittonic took a significant amount of influence from Latin during the Roman period, particularly in terms related to the church as well as Christianity. By the sixth century AD, the tongues of the Celtic Britons were more rapidly splitting into "Neo-Brittonic": Welsh, Cumbric, Cornish, Breton, and possibly the Pictish language.
Over the next three centuries it was replaced in nearly of Scotland by O'Rahilly's historical good example suggests a Brittonic language in Ireland before the introduction of the Goidelic languages, but this picture has not found wide acceptance. Welsh and Breton are the only daughter languages that have survived fully into the advanced day.