Celtic History

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The Viking Impact on the Celtic World

The Norse raids, settlements, and political formations that transformed the Celtic-speaking regions of the British Isles between the late eighth and the eleventh centuries CE.

The Viking age, beginning with the raid on the island monastery of Lindisfarne in 793 CE and continuing for the next two centuries, brought a new wave of upheaval to the Celtic world. Norse raiders, settlers, and traders attacked the Irish and Scottish monasteries, established permanent bases in the Hebrides, the Orkneys, the Isle of Man, and the Irish coast, and produced a new political map in which the old Celtic kingdoms had to find a place alongside the new Norse and Norse-Gaelic polities. The Viking impact on the Celtic world was both destructive and creative, and it is one of the central episodes of the post-Roman Celtic survival. The story of the Viking impact is part of the broader history of the Celtic civilization and is essential to understanding the development of the medieval Celtic-speaking societies of the British Isles.

The First Viking Raids

The Viking raids on the Celtic world began in the last decade of the eighth century, in the same generation that saw the first Viking attacks on the Christian communities of the Frankish Empire. The raid on Lindisfarne in 793 CE, in which a Norse war band attacked the monastery on the tidal island off the coast of Northumbria and carried off both the treasures and the prisoners of the community, is the conventional starting point of the Viking age in the British Isles. The raid was recorded in a number of contemporary sources, including the Anglo-Saxon Chronicle, which described it as a “heathen raid” of unprecedented violence, and it sent shock waves through the Christian communities of the British Isles.

The first Viking raids on the Celtic world were hit-and-run attacks on monasteries and other wealthy targets, conducted by small war bands who arrived by ship, looted what they could, and withdrew before any organized response could be mounted. The monastery of Iona, the foundation of Saint Columba and one of the most important centers of Celtic Christianity, was raided repeatedly in the early ninth century, and the community eventually relocated to Kells in Ireland. The great Irish monasteries of Clonmacnoise, Glendalough, and Armagh suffered similar fates.

The Establishment of Norse Bases

The Viking raids on the Celtic world evolved from hit-and-run attacks into something more substantial in the second quarter of the ninth century. The Norse began to establish permanent bases along the Irish coast, including the longphorts or ship camps that gave the Norse a permanent presence in Ireland. The most important of these was the longphort of Dublin, established around 841 CE, which became the capital of the Norse kingdom of Dublin and one of the most important trading centers of the Viking world. Other Norse bases were established at Waterford, Cork, Limerick, and Wexford, and the resulting Norse presence in Ireland transformed the political and economic life of the island.

The Norse presence in Ireland was not purely a military occupation. The Norse settlers in Ireland were also traders, and the Norse towns of Dublin, Waterford, Cork, and Limerick became important centers of long-distance trade, linking Ireland with the wider Viking world from Scandinavia to the Mediterranean. The Norse brought new technologies to Ireland, including the minting of coins, the use of the longship, and the construction of towns.

The Norse in the Hebrides and the Isle of Man

The Viking impact on Scotland was even more profound than the impact on Ireland. The Norse established control of the Hebrides, the Orkneys, the Shetlands, and the Isle of Man, and the resulting Norse-Gaelic culture of these regions became one of the most distinctive cultural zones of medieval Europe. The Norse takeover of the Hebrides and the Isle of Man was a gradual process that began with the Viking raids of the late eighth and early ninth centuries and continued with the establishment of Norse political authority in the region. The key figure in this process was Ketill Flatnose, a Norse chieftain who, according to the Landnámabók or Book of Settlements, established himself as the ruler of the Hebrides around 870 CE.

The Norse-Gaelic culture of the Hebrides, the Orkneys, the Shetlands, and the Isle of Man was a distinctive synthesis of Norse and Celtic elements. The political organization of the region, the Kingdom of the Isles, was a Norse-Gaelic state that combined Norse and Celtic institutions in a unique way. The language of the region was a hybrid form that drew on both Norse and Celtic vocabulary and grammar, and the art and literature of the region, including the famous carved stones of the Isle of Man, were a unique blend of Norse, Celtic, and Christian elements.

The Kingdom of the Isles

The Kingdom of the Isles, the Norse-Gaelic state that controlled much of the western seaboard of Scotland from the late ninth to the fifteenth century, distinctive political formations of the medieval Celtic world. The kingdom emerged from the Norse takeover of the Hebrides and the Isle of Man, and it developed into a powerful political entity that controlled the seaways of the western seaboard of Scotland and the Irish Sea region. The rulers of the Kingdom of the Isles, known as the lords of the Isles, claimed descent from both Norse and Gaelic royal lines, and they maintained a court at Finlaggan on the island of Islay that combined Norse and Gaelic ceremonial traditions. The lords of the Isles maintained their own fleet, their own laws, and their own coinage, and they were sometimes powerful enough to challenge the kings of Scotland. The kingdom was eventually absorbed by the Scottish crown in the fifteenth century, but the Norse-Gaelic culture of the region survived long after the kingdom itself had disappeared.

The Isle of Man and the Manx Language

The Isle of Man, lying in the Irish Sea between Britain and Ireland, important centers of Norse-Gaelic culture in the Viking age. The island was ruled by Norse kings from the late ninth century, and the resulting Manx-Norse culture combined Norse political institutions with a strong Gaelic linguistic and cultural substrate. The language of the island, Manx-Gaelic, is a member of the Goidelic branch of the Celtic languages.

The Isle of Man produced a remarkable body of medieval literature, including the Chronicle of Mann and the famous Manx legal texts known as the Manx Laws or the Leges Manniæ. The Manx law texts, which survive in manuscripts from the early fourteenth century, are a unique record of the legal and social institutions of a Norse-Gaelic society. The Manx language survived into the present, although the last traditional speaker, Ned Maddrell, died in 1974, and the language has been studied as a successful revival movement today.

The Norse in Wales and Southwest Scotland

The Viking impact on Wales was less dramatic than the impact on Ireland and Scotland, but it was nevertheless significant. Norse settlers established themselves in several parts of Wales, especially in the coastal regions and in the islands off the Welsh coast. The Wirral peninsula, on the Welsh-English border, was settled by Norse-speaking populations in the tenth and eleventh centuries, and the Norse also settled in Pembrokeshire, in the southwest of Wales, where the resulting Norse presence was a distinctive feature of the region. The Viking impact on southwest Scotland, the region of what would become the kingdom of Strathclyde, was also significant, and the Brittonic Celtic-speaking kingdom of Strathclyde, which had been one of the most important of the post-Roman Brittonic kingdoms, gradually gave way to the Norse-Gaelic political formations of the region.

The Recovery of the Celtic World

The Viking impact on the Celtic world was eventually contained, and the Celtic-speaking societies of the British Isles, although transformed by the Viking experience, emerged from the Viking age as distinctive and self-confident polities. In Ireland, the high king Brian Boru defeated the Norse of Dublin at the battle of Clontarf in 1014 CE, a battle that, while not ending the Norse presence in Ireland, marked the beginning of a new phase in which the Irish kings established their authority over the Norse towns. In Scotland, the Gaelicization of the Pictish north and the rise of the Scottish kingdom under the MacAlpin dynasty created a unified Gaelic-speaking political entity that was able to absorb the Norse-Gaelic kingdoms of the west.

The legacy of the Viking age in the Celtic world is still visible in the place names, the genetic heritage, and the cultural traditions of the modern Celtic-speaking regions, and it is an essential part of the story of the post-Roman Celtic survival and of the history of the Celtic civilization as a whole.

More in Post-Roman Celtic Survival

What Happened to the Celts After Rome Fell The transformation of the Celtic world in the fifth and sixth centuries CE, from the collapse of Roman authority to the rise of the Anglo-Saxon kingdoms and the survival of the Brittonic Celtic societies of the west.