Celtic Britons

• 1. Introduction

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  Celtic Britons inhabited Great Britain for well over a thousand years, from at least the Iron Age until the High Middle Ages, and their descendants still speak languages descended from their ancient tongue today. When the Greek geographer Pytheas sailed around the British Isles sometime between 330 and 320 BC, he became the first known outsider to write about the people living there. None of his writings survive, but later authors preserved what he recorded. The ancient Greeks called these island dwellers the Pretanoi or Bretanoi. Pliny's Natural History, written in 77 AD, records that an even older name for the island was Albion. Who exactly were these people? What language did they speak? How did they relate to the Romans who eventually marched across their lands? And what happened to them when those Romans left, and wave after wave of new settlers began claiming their territory? The answers stretch from the Atlantic coast of Galicia in Spain all the way to the Fens of eastern England, and from a world of hillforts and druids to a living community of Welsh speakers in Patagonia, Argentina.

• 2. A Name Across Centuries

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  The P-Celtic ethnonym reconstructed as Pritani likely carries the meaning "people of the forms" or "shapely people". Linguists trace it to Common Celtic kwritu, which became Old Irish cruth and Old Welsh pryd. That root may also connect to the Latin word Picti, the name Romans gave to the unconquered peoples of the far north, usually explained as meaning "painted people". The Old Welsh name for those same northern people was Prydyn. Linguist Kim McCone suggests the name Pritani became restricted to the northernmost inhabitants once Cymry displaced it as the label for the Welsh and Cumbrians.

  The medieval Welsh form of the Latin Britanni was Brython, and the scholar John Rhys formally introduced that term into English usage in 1884, specifically to name the P-Celtic speakers of Great Britain in contrast to Goidel, the equivalent label for Gaelic speakers. The adjective Brythonic followed, and the phrase "Brittonic languages" is more recent still, first recorded in 1923 according to the Oxford English Dictionary.

  After the Anglo-Saxon settlement of Britain, the newcomers called all Britons either Bryttas or Wealas, the origin of the modern word Welsh. From around the 11th century, the different surviving Brittonic groups began to be named separately as the Welsh, Cornish, Cumbrians, and Bretons. The word prydydd, meaning "maker of forms" in Welsh, was also the term for the highest grade of a bard, suggesting that whatever the name originally meant, it carried deep cultural weight well beyond simple geography.

• 3. Language and Its Branches

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  Common Brittonic was spoken throughout the whole island of Britain and the Isle of Man. Its roots lay in the Insular branch of Proto-Celtic, which arrived in the British Isles from the continent at some point between the 10th and the 7th century BC. Over time the language split into regional forms. Some linguists group these as Western and Southwestern Brittonic.

  Western Brittonic developed into Welsh in Wales and into Cumbric in the Hen Ogledd, the "Old North" of Britain covering modern northern England and southern Scotland. The Southwestern dialect became Cornish in Cornwall and South West England, and Breton in the region the Romans called Armorica, which is now called Brittany because of its Brittonic settlers. Early medieval tradition, including the text known as The Dream of Macsen Wledig, describes those Armorican Celtic speakers as colonists from Britain, and the Breton language was identical to Cornish in its earliest phase.

  Pictish, long considered a mysterious separate language, is now generally accepted by scholars to descend from Common Brittonic rather than being a distinct Celtic tongue. Place names and personal names recorded in the Irish annals support that view. Welsh and Breton still have living speaker communities today. Cumbric and Pictish both died out in the 12th century. Cornish declined to near extinction but has been the subject of active revitalization since the 20th century, and is still spoken.

• 4. Origins and the Bronze Age Migration

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  Scholars have debated for generations when Celtic peoples and their languages first arrived in Britain, and no single hypothesis has gained consensus. The traditional view, dominant through most of the 20th century, held that Celtic culture grew from the central European Hallstatt culture and reached Britain in the first millennium BC. John Koch and Barry Cunliffe later challenged this with their "Celtic from the West" theory, arguing that Celtic developed as a maritime trade language in the Atlantic Bronze Age cultural zone before spreading eastward. Patrick Sims-Williams criticized both approaches and proposed "Celtic from the Centre", placing Celtic origins in Gaul with a spread into Britain toward the end of the first millennium BC.

  A major archaeogenetics study published in 2021 changed the terms of the debate. It documented a migration into southern Britain over roughly five hundred years, from 1,300 BC to 800 BC. The migrants were genetically most similar to ancient individuals from France and carried higher levels of Early European Farmers ancestry. Between 1000 and 875 BC, their genetic marker spread rapidly through southern Britain, accounting for around half the ancestry of subsequent Iron Age people in that zone, though not in northern Britain.

  The study's authors described the genetic shift as consistent with "sustained contacts between mainland Britain and Europe over several centuries, such as the movement of traders, intermarriage, and small-scale movements of family groups", rather than a violent invasion. They called this pattern a "plausible vector for the spread of early Celtic languages into Britain". Barry Cunliffe, drawing on these results, suggested that a branch of Celtic was already present in Britain before the Bronze Age migration, and that the migration specifically introduced the Brittonic branch. Since there was much less migration into Britain during the subsequent Iron Age, the genetic and linguistic evidence points to Celtic arriving before that period.

• 5. Rome and Resistance

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  In 43 AD, Roman legions invaded Britain. The British tribes fought back for decades, but by 84 AD the Romans had conquered southern Britain and pushed into Brittonic territory that would later become northern England and southern Scotland. In 122 AD they fortified the northern border with Hadrian's Wall, which spanned what is now Northern England, running through the modern counties of Northumberland and Cumbria. Twenty years later, in 142 AD, Roman forces advanced again and built the Antonine Wall between the Forth and Clyde isthmus, but they pulled back to Hadrian's Wall after about twenty years.

  North of Hadrian's Wall, Brittonic-Pictish peoples including the Caledonians remained unconquered. Julius Caesar, writing in Commentarii de Bello Gallico, noted that the Britons considered it "contrary to divine law to eat the chicken, the hare, or the goose." Archaeological evidence supports this: pre-Roman Britons do not appear to have eaten chicken or hares. During the late Iron Age and early Roman period, chickens and hares began to appear in human burials, suggesting ritual significance. Chicken was not widely eaten in some parts of Britain until the 3rd century CE, and then primarily in heavily Romanised urban centres.

  Roma-British culture did develop, mainly in the southeast, and British Latin coexisted alongside Brittonic. The Roman Empire retained control of Britannia until its departure around 410 AD, though parts of Britain had effectively shed Roman authority decades before that final withdrawal. Hadrian's Wall had defined the western edge of the empire; what lay beyond it remained a separate world. The carnyx, a war trumpet with an animal-headed bell, was used by Celtic Britons during both battle and ceremony throughout this period.

• 6. The Long Retreat

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  Roughly fifty years after Roman forces left, Germanic-speaking Anglo-Saxons began migrating to the southeastern coast of Britain and establishing their own kingdoms. Old Irish-speaking Scoti moved from Dal nAraidi in modern Northern Ireland to the west coast of Scotland and the Isle of Man. Brittonic kingdoms fell in sequence over the following centuries. The kingdom of Ceint, covering modern Kent, fell in 456 AD. Linnuis, which straddled modern Lincolnshire and Nottinghamshire, was absorbed as early as 500 AD and became the English Kingdom of Lindsey. Regni, covering modern Sussex and eastern Hampshire, was likely fully conquered by 510 AD.

  Elmet, a substantial kingdom covering much of modern Yorkshire, Lancashire, and Cheshire with its capital probably at modern Leeds, was conquered by the Anglo-Saxons in 627 AD. Meanwhile, Old Irish-speaking Gaels had arrived on the northwest coast from Ireland and founded Dal Riata, which encompassed modern Argyll, Skye, and Iona, between 500 and 560 AD. Pengwern, covering Staffordshire, Shropshire, Herefordshire, and Worcestershire, was largely destroyed in 656 AD.

  Some Brittonic kingdoms held out far longer. The kingdom of Ystrad Clud, known as Strathclyde, was one of the most resilient. At its peak it encompassed modern Strathclyde, Dumbartonshire, Cumbria, Stirlingshire, Lanarkshire, Ayrshire, Dumfries and Galloway, Argyll and Bute, and reached as far as modern Leeds in West Yorkshire. It resisted Anglo-Saxon, Gaelic Scots, and Viking attacks for centuries, and only fell in the 1090s when it was effectively divided between England and Scotland, making it the last Brittonic kingdom of the Old North to disappear.

• 7. Colonies on the Continent

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  While Brittonic kingdoms were falling across Britain, Britons were establishing themselves overseas. In the late 5th and early 6th centuries AD, colonists founded a settlement called Britonia in Galicia in northwestern Spain. This colony first appears in the historical record at the First Council of Lugo in 569 AD. A separate bishopric was later established, with Maeloc as its first bishop. The colony appears to have faded soon after 900 AD, but Brittonic roots are preserved in place names across Galicia and Asturias containing the elements bret- or brit-, including Bretelo in Ourense, Bertonya in A Capela, and El Breton in Corvera, Asturias.

  The larger and more enduring colony was Brittany, in what is now northwestern France. The Channel Islands were colonised by Britons in the 5th century. Medieval historical tradition holds that the post-Roman Celtic speakers of Armorica came from Britain rather than from Gaulish or Frankish roots, which is why the Breton language is related to Welsh and not to any variety of French.

  The Channel Islands came under Norse and Danish Viking attack in the early 9th century and had been conquered by Viking invaders by the end of that century. Brittany lasted far longer as an independent Brittonic entity. Wales united with England under the Laws in Wales Acts 1535-1542, during the rule of the Tudors, who were themselves of Welsh heritage on the male side. Brittany was united with France in 1532. Today, more than 1,500 Welsh speakers live in Patagonia, Argentina, in a community called Y Wladfa, founded by Welsh farmers who migrated there in the 19th century.

• 8. Who They Were, Genetically

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  Schiffels and colleagues, in a 2016 study, examined the remains of three Iron Age Britons buried around 100 BC. A female found at Linton in Cambridgeshire carried the maternal haplogroup H1e. Two males buried at Hinxton both carried the paternal haplogroup R1b1a2a1a2, along with different maternal haplogroups. Their genetic profile was considered typical for Northwest European populations. What set them apart was how different they were from later Anglo-Saxon samples, who were genetically much closer to Danes and Dutch people.

  Martiniano and colleagues, in a 2018 study, examined a female Iron Age Briton buried at Melton between 210 BC and 40 AD, along with seven males buried at Driffield Terrace near York during the 2nd through 4th centuries AD. Six of those Roman-period males were identified as native Britons. All six carried varieties of the paternal haplogroup R1b1a2a1a. Those indigenous Britons of Roman Britain were genetically close to the earlier Iron Age female from Melton, and displayed strong genetic links to modern Celts of the British Isles, particularly Welsh people. This points to substantial genetic continuity running from Iron Age Britain through the Roman period and into the present.

  By contrast, the Anglo-Saxon individual examined in that same study was genetically substantially different from the native Britons, and modern English populations in the same geographic areas are also genetically distinct from these ancient Britons. The implication is that the Anglo-Saxon settlement of Britain brought a genuine and lasting demographic change, not merely a cultural overlay. At the same time, the Welsh, Cornish, and Breton populations today carry a genetic inheritance that connects them to those Iron Age individuals buried more than two thousand years ago.