The lost ancestor of Welsh, Cornish, and Breton
Before the rise of Old English, a single language unified much of Britain and Brittany. Known as Common Brittonic, this ancient tongue left behind no written books, only hidden traces in river names, ancient curses, and the very map of the British Isles.
Common Brittonic was a form of Insular Celtic that served as the common ancestor for the later Brittonic languages. While no surviving documents written entirely in this language exist, its presence is felt through archaeological fragments and toponymy. For instance, a metal pendant discovered in 1979 at the Roman baths in Bath, Somerset, contains an ancient Brittonic curse involving names like Deuina and Uindiorix. Similarly, the Roman-era geography of Ptolemy records various place names that were likely Brittonic in origin.
The language underwent significant shifts due to historical pressures. Following the Roman conquest in AD 43, the language vied with Latin, eventually absorbing Latin vocabulary related to Christianity and the church. By the sixth century AD, the language began to diverge into what scholars call Neo-Brittonic dialects, including Welsh, Cumbric, Cornish, and Breton. While Cumbric disappeared by the 12th century and Cornish faced near-extinction in the 18th century, Welsh and Breton have survived as the only direct descendants into the modern era.
The linguistic footprint of Common Brittonic remains embedded in the English landscape. Many modern names are direct descendants or cognates: the river Avon derives from the Brittonic 'abonā' (river), and Dover likely stems from 'Dubrīs' (waters). Even the name 'Britain' is thought to be cognate with 'Pritani', meaning 'People of the Forms'. While the exact relationship between Brittonic and the language of the Picts remains a subject of scholarly debate, the linguistic echoes of this ancient tongue continue to shape the geography of the West.
The evolution of the language also involved complex phonetic changes. In its early stages, the vowel inventory was nearly identical to Proto-Celtic. However, by the late Common Brittonic period, the 'New Quantity System' caused a radical restructuring of the vowel system. In the precursors to Welsh, specific changes occurred where short pretonic vowels shifted into mid-central schwa sounds.
Source: Common Brittonic
