Western Brittonic languages ( cy, Brythoneg Gorllewinol) comprise two

dialect The term dialect (from Latin , , from the Ancient Greek word , 'discourse', from , 'through' and , 'I speak') can refer to either of two distinctly different types of Linguistics, linguistic phenomena: One usage refers to a variety (linguisti ...

s into which

Common Brittonic Common Brittonic ( cy, Brythoneg; kw, Brythonek; br, Predeneg), also known as British, Common Brythonic, or Proto-Brittonic, was a Celtic language spoken in Britain and Brittany. It is a form of Insular Celtic, descended from Proto-Celtic, a ...

split during the

Early Middle Ages The Early Middle Ages (or early medieval period), sometimes controversially referred to as the Dark Ages, is typically regarded by historians as lasting from the late 5th or early 6th century to the 10th century. They marked the start of the Mi ...

; its counterpart was the ancestor of the

Southwestern Brittonic languages The Southwestern Brittonic languages ( kw, Brythonek Dyghowbarthgorlewin, br, Predeneg Kreisteizkornôg) are the Brittonic Celtic languages spoken in what is now South West England and Brittany since the Early Middle Ages. During the period of ...

. The reason and date for the split is often given as the

Battle of Deorham The Battle of Deorham (or Dyrham) is claimed as a decisive military encounter between the West Saxons and the Britons of the West Country in 577. The battle, which was a major victory for Wessex's forces led by Ceawlin and his son, Cuthwine, r ...

in 577, at which point the victorious

Saxons The Saxons ( la, Saxones, german: Sachsen, ang, Seaxan, osx, Sahson, nds, Sassen, nl, Saksen) were a group of Germanic * * * * peoples whose name was given in the early Middle Ages to a large country (Old Saxony, la, Saxonia) near the Nor ...

Wessex la, Regnum Occidentalium Saxonum , conventional_long_name = Kingdom of the West Saxons , common_name = Wessex , image_map = Southern British Isles 9th century.svg , map_caption = S ...

essentially cut Brittonic-speaking Britain in two, which in turn caused the Western and Southwestern branches to develop separately. Western Brittonic languages were spoken in

Wales Wales ( cy, Cymru ) is a Countries of the United Kingdom, country that is part of the United Kingdom. It is bordered by England to the Wales–England border, east, the Irish Sea to the north and west, the Celtic Sea to the south west and the ...

and the ', or "Old North", an area of

northern England Northern England, also known as the North of England, the North Country, or simply the North, is the northern area of England. It broadly corresponds to the former borders of Angle Northumbria, the Anglo-Scandinavian Kingdom of Jorvik, and the ...

and southern

Scotland Scotland (, ) is a country that is part of the United Kingdom. Covering the northern third of the island of Great Britain, mainland Scotland has a border with England to the southeast and is otherwise surrounded by the Atlantic Ocean to the ...

. One Western language evolved into

Old Welsh Old Welsh ( cy, Hen Gymraeg) is the stage of the Welsh language from about 800 AD until the early 12th century when it developed into Middle Welsh.Koch, p. 1757. The preceding period, from the time Welsh became distinct from Common Brittonic ...

and thus to the modern

Welsh language Welsh ( or ) is a Celtic language family, Celtic language of the Brittonic languages, Brittonic subgroup that is native to the Welsh people. Welsh is spoken natively in Wales, by some in England, and in Y Wladfa (the Welsh colony in Chubut P ...

; the language of ',

Cumbric Cumbric was a variety of the Common Brittonic language spoken during the Early Middle Ages in the ''Hen Ogledd'' or "Old North" in what is now the counties of Westmorland, Cumberland and northern Lancashire in Northern England and the souther ...

, became extinct after the expansion of the

Middle Irish Middle Irish, sometimes called Middle Gaelic ( ga, An Mheán-Ghaeilge, gd, Meadhan-Ghàidhlig), is the Goidelic language which was spoken in Ireland, most of Scotland and the Isle of Man from AD; it is therefore a contemporary of late Old Engli ...

-speaking polity. Southwestern Brittonic became the ancestor to Cornish and

Breton Breton most often refers to: *anything associated with Brittany, and generally ** Breton people ** Breton language, a Southwestern Brittonic Celtic language of the Indo-European language family, spoken in Brittany ** Breton (horse), a breed **Ga ...

. Alan James has suggested that Cumbric and

Pictish Pictish is the extinct language, extinct Brittonic language spoken by the Picts, the people of eastern and northern Scotland from Late Antiquity to the Early Middle Ages. Virtually no direct attestations of Pictish remain, short of a limited num ...

were closer aligned to one another than they were to Welsh.James, A. G. (2008): 'A Cumbric Diaspora?' in Padel and Parsons (eds.) A Commodity of Good Names: essays in honour of Margaret Gelling, Shaun Tyas: Stamford, pp 187–203

References

Brittonic languages Extinct Celtic languages Languages attested from the 6th century Languages extinct in the 8th century {{IndoEuropean-lang-stub