Celtic History

Article

When Did the Celts First Arrive in Britain

The prehistoric migrations that brought Celtic-speaking peoples to the British Isles, from the late Bronze Age to the Iron Age, and the archaeological and linguistic evidence for their arrival.

The question of when Celtic-speaking peoples first arrived in the British Isles is one of the most debated topics in European archaeology, with traditions of two main waves of migration giving way to more complex pictures drawn from archaeology, linguistics, and ancient DNA. To follow the Celts in the British Isles is to follow a long story of migration and cultural transformation that began well before the first written records and that left its mark on the language, the material culture, and the political organization of every part of the islands. The arrival of the Celts in Britain is part of the broader history of the Celtic civilization and is intimately connected to the origins and emergence of the Celts on the European continent.

The Traditional Two-Wave Model

The traditional account, inherited from nineteenth-century Celtic scholarship, held that the British Isles received two main waves of Celtic-speaking migrants from the continent. The first wave, often called the Goidelic or Q-Celtic migration, was supposed to have brought the ancestors of the Goidelic Celtic languages — Irish, Scottish Gaelic, and Manx — to the British Isles in the late Bronze Age or early Iron Age, perhaps around 600 to 500 BCE. The second wave, the Brythonic or P-Celtic migration, was supposed to have brought the ancestors of the Brythonic Celtic languages — Welsh, Cornish, Breton, and Cumbric — to Britain in the later Iron Age, perhaps around 300 to 100 BCE.

The two-wave model was built on a combination of linguistic and archaeological evidence. The linguistic evidence came from the distinction between the Goidelic and Brythonic Celtic languages, which differ in the treatment of the Indo-European kw sound: Goidelic languages preserve it as a k sound (as in Irish ceathair, “four”), while Brythonic languages change it to a p sound (as in Welsh pedwar, “four”).

The Modern Critique

The two-wave model has been challenged by modern scholarship on several grounds. Linguists have pointed out that the Q-Celtic and P-Celtic distinction could have arisen within the British Isles itself, after a single group of Celtic speakers had settled there, rather than reflecting two separate migrations. Archaeologists have shown that the introduction of La Tène material culture to the British Isles was a complex and gradual process, with many regional variations, rather than a single discrete event. Population geneticists, working with the new evidence of ancient DNA, have shown that the population history of the British Isles was much more complex than a simple two-wave model would suggest.

The current consensus is that the British Isles received several migrations of Celtic-speaking peoples over a long period, beginning in the late Bronze Age and continuing into the early Iron Age, and that the linguistic and cultural distinctions between the various Celtic-speaking communities of the islands developed gradually and in interaction with the local populations.

The Late Bronze Age Background

The background to the Celtic arrival in the British Isles is the late Bronze Age of the second millennium BCE, a period of considerable cultural and economic complexity in the islands. The Wessex culture of southern England, the Tay-Forth culture of eastern Scotland, and the various regional cultures of Wales, Cornwall, and Ireland all produced remarkable metalwork, including the spectacular bronze shields, cauldrons, and gold ornaments of the Ewart Park phase of the late Bronze Age. The late Bronze Age of the British Isles was a period of long-distance trade, of social complexity, and of contact with the European continent.

The linguistic affiliations of the late Bronze Age populations of the British Isles are unknown. The place names of Britain and Ireland include a layer of names that may predate the arrival of Celtic languages, and these names are sometimes interpreted as evidence of a pre-Celtic substrate population. The pre-Celtic languages of the British Isles are unknown and probably unidentifiable, and the question of how Celtic languages replaced them is one of the central problems of the archaeology of the British Isles.

The First Celtic Arrivals

The first clear evidence for the presence of Celtic-speaking peoples in the British Isles comes from the late Bronze Age and early Iron Age, roughly 800 to 600 BCE. In this period, certain elements of continental Celtic material culture begin to appear in the archaeological record of southeastern Britain, including La Tène style brooches, swords, and ornaments. The earliest Celtic-style metalwork in Britain is found primarily in southern and eastern England, in the areas that would later form the heartland of the British Celtic world, and it suggests a process of contact and migration across the English Channel rather than a single dramatic invasion.

The first Celtic arrivals in Britain were probably small in number, and they were probably absorbed into the existing late Bronze Age population over a long period. The Celtic languages, however, were clearly established in the British Isles by the end of the early Iron Age, and the linguistic evidence suggests that Celtic-speaking populations had become the dominant cultural and political force in the islands well before the end of the prehistoric period.

The Iron Age Celtic World of Britain

By the fourth and third centuries BCE, the Celtic world of Britain was fully established. The material culture of Iron Age Britain, including the introduction of the war chariot, the long Celtic sword, the round shield, the iron spearhead, and the elaborate La Tène style metalwork, shows close connections with the continental Celtic world, especially with the Armorican and Belgic regions of northwestern Gaul. The archaeological record of late Iron Age Britain is rich and varied, with hundreds of hill forts, many of substantial size, dotting the landscape of southern and central England.

Caesar, who invaded Britain in 55 and 54 BCE, describes a society organized into tribes and kingdoms, the most important of which were the Catuvellauni in the southeast, the Trinovantes in Essex, the Iceni in East Anglia, the Brigantes in the north, the Silures in south Wales, and the Ordovices in north Wales. Caesar also describes a powerful religious class, the Druids, whom he believed had their principal seat in Britain, and a system of social organization that he compares to that of Gaul.

The Celtic Settlement of Ireland

The Celtic settlement of Ireland is one of the most debated topics in Irish archaeology. The traditional account, derived from medieval Irish sources such as the Lebor Gabála Érenn or Book of Invasions, attributes the settlement of Ireland to a series of waves of invaders, the last of which was the Gaelic or Milesian invasion that gave Ireland its Gaelic-speaking population. The Lebor Gabála is a mythological work, written down by Christian monks in the eleventh and twelfth centuries, and its historical value is limited, but it preserves a tradition of migration and settlement that has been the basis of Irish national identity for centuries.

The most plausible model for the Celtic settlement of Ireland combines elements of migration and cultural diffusion. Celtic-speaking populations arrived in Ireland in the late Bronze Age or early Iron Age, possibly in several small groups rather than a single large migration, and they gradually established cultural and political dominance over the existing late Bronze Age population. The Celtic language and material culture spread across the island over a long period, and the population genetic evidence suggests a substantial continuity of the local Bronze Age population alongside the Celtic cultural and linguistic overlay.

Population Genetics and the Celtic Question

The development of ancient DNA analysis has revolutionized the study of the Celtic settlement of the British Isles. Studies of DNA from late Bronze Age and Iron Age burials in Britain and Ireland have shown a substantial influx of new population from the continent in the late Bronze Age, around 1000 to 800 BCE, with significant genetic changes that cannot be explained by local continuity alone. The genetic evidence is consistent with a substantial migration of Celtic-speaking peoples into the British Isles in the late Bronze Age, in line with the traditional view of Celtic migrations but at an earlier date than the two-wave model would suggest.

The Celts and the Picts

The relationship between the Celtic-speaking populations of Britain and the Picts of northern Scotland is one of the most debated topics in early medieval British history. The Pictish language is known mainly from a small corpus of inscriptions, place names, and personal names, and its classification has been one of the most intractable problems of Celtic linguistics. Most recent analyses favor a Brittonic classification, suggesting that the Picts spoke a Celtic language related to Welsh, but the matter is far from settled. The question of how the Pictish language fits into the broader Celtic language family remains one of the most active areas of research in Celtic studies.

More in The Celts in the British Isles

Why the Romans Never Conquered Ireland The Roman expeditions, intelligence gathering, and strategic calculations that left Hibernia beyond the empire, and the consequences for the development of medieval Celtic civilization in Ireland.