The sacred geography of the Celtic world was one of the densest and most varied of any ancient European civilization, a vast network of holy places in which the natural features of the landscape, the ritual monuments of the past, and the political and religious centers of Celtic society all served as foci for the worship of the gods and the practice of pilgrimage. To study the sacred sites and pilgrimage traditions of the Celtic peoples is to enter a world in which every grove, every spring, every hill, and every standing stone might be the dwelling place of a god, in which the boundary between the sacred and the profane was marked by particular topographical features, and in which the journey of a pilgrim to a particular sanctuary might be the central act of a religious life. As part of the broader world of Celtic religion, mythology, and spirituality, these sites were the physical context in which the religious ideas of the Celtic peoples were expressed and renewed.
The evidence for Celtic sacred sites is unusually rich. The classical sources, especially Caesar, Strabo, Pomponius Mela, and Lucan, give detailed accounts of particular sanctuaries in Gaul and Britain. The archaeological record of votive deposits, ritual monuments, and sanctuary structures extensive in ancient Europe, and it has been studied as intensive study, particularly in France, Germany, and the British Isles. The medieval manuscript tradition of Ireland, Wales, and Brittany preserves a vast body of legends, saints’ lives, and place-name traditions that document the survival of the older sacred sites into the Christian period. And the living tradition of pilgrimage, holy wells, and folk customs in the modern Celtic-speaking regions continues to bear witness to the enduring power of the older sacred geography.
Sacred Groves
The sacred grove was, by general agreement of the classical sources, the most characteristic and most venerated type of Celtic sanctuary. Caesar famously described a sacred grove in the territory of the Carnutes, in central Gaul, that was held in special veneration by the Druids, and he noted that it was the central sanctuary of the Gallic Druids, that it was the place where the Druids met annually, and that the penalty for cutting its trees was death. Strabo, writing in the late first century BCE, mentions several sacred groves in Gaul where rites were performed, and Lucan, in his epic poem Pharsalia, lists a sacred grove near Massilia (modern Marseille) that was famous for its ancient oaks and its Druidic ceremonies. The trees were usually oaks, and the mistletoe that grew on them, particularly the rare and revered mistletoe of the oak, was a particular focus of ritual. The cutting of the mistletoe at a particular phase of the moon with a golden sickle, as described by Pliny the Elder, famous of all Druidic ceremonies.
The persistence of the older sacred groves into the Christian period is attested by a number of historical and archaeological sources. The Silva Carbonaria, the charcoal forest, on the border between Roman Gaul and Germania, was a sacred forest that gave its name to a Roman provincial boundary. The Treveran sanctuary at the Heidenpütz in the Eifel region continued to attract votive deposits well into the Roman period. In the insular Celtic world, the sacred grove of Bile at Uisnech in County Westmeath in Ireland and the sacred trees of the Welsh tradition all preserve the older tradition in transformed form.
Rivers, Springs, and Healing Sanctuaries
The rivers of the Celtic world were sacred in their own right, and many of the great rivers of western Europe bear the names of Celtic river goddesses. The Sequana, goddess of the Seine, was worshipped at a major healing sanctuary at the source of the river near Dijon, and her cult is attested by hundreds of votive inscriptions. The Matrona, goddess of the Marne, was worshipped at a sanctuary at the source of the river, and the Mosella, goddess of the Moselle, was venerated throughout the valley. The great altars of the Nehalennia at the mouth of the Rhine in the Netherlands show the persistence of the older river cult into the second and third centuries CE.
The great healing sanctuaries of the continental Celtic world were often built at the sources of rivers, where the springs were believed to have curative properties. The sanctuary of Sequana at the source of the Seine, the sanctuary of Sirona at the source of the Moselle, the sanctuary of Bormo and Damona at Bourbonne-les-Bains, and the sanctuary of Apollo Grannus at Faimingen in Bavaria, all combined sacred springs with bathing facilities, hostels for pilgrims, and extensive collections of votive offerings. The anatomical votives, the small models of the part of the body that was to be healed, are among the most striking objects of the Gallo-Roman religious world. The persistence of these healing cults well into the Roman period, and the incorporation of many of the older Celtic healing deities into the Roman pantheon as Apollo and Sulis Minerva, striking features of the religious life of the Roman Celtic provinces.
Lakes and the Aquatic Otherworld
Lakes were particularly important in the Celtic sacred geography, especially in the continental Celtic world and in the insular Celtic traditions. The type site of La Tène itself, at the eastern end of Lake Neuchâtel, has given its name to the entire La Tène culture, and the thousands of iron and bronze objects deposited in the lake, probably as votive offerings, are some of the most important archaeological finds of the Celtic world. The lakes of Bourget, Annecy, and Geneva have all produced significant finds of Celtic votive objects, and the great hoard of Desborough in Northamptonshire, with its collection of La Tène metalwork, was almost certainly deposited in a wet context.
The medieval Irish and Welsh traditions preserve a particularly rich set of associations between lakes and the Otherworld. The lakes of Ireland, with their sídhe and their underwater kingdoms, were believed to be gateways to the Otherworld. The Loch Derg in County Donegal, with its purgatorial associations in the Christian period, has a much older tradition as a place of entry to the Otherworld, and the crannogs of early medieval Ireland and Scotland, the artificial island dwellings built in lakes and bogs, are direct continuations of the older pattern of lake-side settlement and lake-side cult.
Stone Circles, Standing Stones, and Megalithic Monuments
The stone circles and standing stones of the British Isles and Brittany, many of them built in the late Neolithic and early Bronze Age, long before the emergence of the historical Celtic peoples, continued to be venerated throughout the Celtic period and in some cases into the early Christian period. The great stone circle of Stonehenge in Wiltshire, the stone circles of Avebury and Castlerigg, the standing stones of Callanish in the Outer Hebrides, the Ring of Brodgar in Orkney, and the great alignments of Carnac in Brittany were all sites of long-standing ritual activity that extended well into the Celtic Iron Age and even later. The evidence of votive deposits, of associated pottery, and of continued ritual activity at many of these sites suggests that the older monuments were indeed significant in the religious life of the later Celtic peoples.
The stone circles of the British Isles, of which about a thousand are known, are particularly associated with the insular Celtic traditions. The recumbent stone circles of northeastern Scotland, with their characteristic setting of a large recumbent stone flanked by two tall uprights, often have astronomical alignments. The four-poster and axial stone circles of southwest Ireland, often associated with early Christian sites, may preserve older traditions of stone circle use into the Christian period. The Ring of Brodgar in Orkney, the great henge of Knowth and Newgrange in the Boyne valley, and the passage tombs of Carrowmore in County Sligo are all older monuments that continued to be venerated in the Celtic period.
The standing stones of the Celtic world, often called menhirs in the French archaeological tradition, were typically tall, single upright stones, sometimes with carved decoration, that were venerated as the dwelling places of spirits. Many of these stones have been preserved in the modern landscape as part of the local folklore, and their associated legends often preserve older traditions of cult. The petites pierres of Brittany, the clogháns of Ireland, and the many single standing stones of Wales, Scotland, and Cornwall are all part of this older tradition.
Hilltop Sanctuaries and Hill Forts
Hilltop sites were among the most prominent features of the Celtic sacred landscape, and many of the great hill forts of Iron Age Britain, Gaul, and central Europe had important ritual as well as defensive functions. The great Maiden Castle in Dorset, Cadbury Castle in Somerset, and Yeavering in Northumberland were not simply defensive enclosures but also centers of political and religious life. The great Oppidum of Bibracte in Burgundy and the Heuneburg in southern Germany are examples of continental hilltop sanctuaries that combined defensive, residential, and ritual functions.
The ritual use of hilltops in the Celtic world is also attested by the many promontory forts and cliff sanctuaries of the Atlantic coast. The Dun Aengus on the island of Inishmore in the Aran Islands, the Tre’r Ceiri in North Wales, and the Carn of Gavrinis in Brittany are all hilltop or cliff-top sites that combine defensive, residential, and ritual functions. In the medieval Irish tradition, the Sidhe of Cruachan was a hill in County Roscommon believed to be the entrance to the Otherworld, and the Dagda himself was said to dwell on the Cnoc of the Paps of Anu in County Kerry.
Assembly Sites and the Cult of the Center
The assembly sites of the Celtic world, the places where the political, legal, and religious activities of the community were concentrated, were often marked by particular topographical features. The Irish Tara, the Emain Macha, the Cruachan, the Dún Ailinne, and the Uisnech were the major assembly sites of early medieval Ireland, and most of them combined natural features with built structures like palaces and enclosures. The Welsh Gorsedd of bards and the Eisteddfod of the princes were similar in character, combining political, legal, and ritual functions in a single topographical setting. The continental Oppida, particularly the great Bibracte in Burgundy, were similar centers of political and ritual life.
The cult of the center, the sacred axis that connected the worlds, was a central feature of the Celtic religious imagination. The Uisnech in Ireland, with its Cat Stone at the center of the five provinces, was the symbolic center of the island, the place from which the whole of Ireland was measured. The Tara in County Meath, with its Lia Fáil (the stone of destiny) and its ritual enclosure, was the political and religious center of the High Kingship. The Maiden Castle and Stonehenge in England, the Carrowmore and Newgrange in Ireland, and the Carnac alignments in Brittany were all centers of the older sacred geography.
The Celtic sacred sites were not simply local centers of cult. They were often the destinations of pilgrimages that could extend over many days. The annual gathering at the sanctuary of the Carnutes in Gaul, which Caesar describes, important such occasions, and it was attended by Druids and representatives of the Gallic tribes from all over Gaul. The great healing sanctuaries of the Gallo-Roman world, particularly those of Sequana and Grannus, attracted pilgrims from across the Roman Celtic provinces, and the Sanctuary of Sulis Minerva at Bath attracted pilgrims from as far away as the Rhineland and the Danube.
In the insular Celtic world, the pilgrimage tradition was equally well developed. The great monastic centers of early medieval Ireland, including Armagh, Clonmacnoise, Glendalough, Kells, and Bangor, were major destinations of pilgrimage. The pilgrimage to the Purgatory of Saint Patrick in Lough Derg in County Donegal, although primarily a medieval Christian phenomenon, drew on much older traditions of the lake as a gateway to the Otherworld. The Welsh Bardsey Island was a major destination of medieval pilgrimage, and the survival of the pilgrimage tradition at Bardsey into the present striking examples of the continuity of the older sacred geography.
Continuity into the Christian Period
The transition from the pagan to the Christian sacred landscape was not a sudden break but a long and complex process of negotiation, in which many older sacred sites were incorporated into the new Christian geography. The technique of interpretatio Christiana, by which pagan deities were identified with Christian saints and pagan sites were rededicated to Christian patrons, was a central feature of this process. The pagan goddess Brigid became the Christian Saint Brigid, the pagan Sequana became the Christian Saint Sequanus, and the pagan Belenus became the Christian Saint Colman in various local traditions. The older sacred wells, sacred groves, and sacred hills were similarly rededicated, and many of them continued to be sites of pilgrimage, healing, and ritual activity well into the present.
The Christian monastic tradition itself, in the Celtic-speaking regions, was deeply influenced by the older sacred geography. The great monasteries of Ireland, Scotland, and Wales were often founded at sites that had been important in the older pagan religion, often a deliberate attempt to appropriate the spiritual power of the older place for the new religion. The foundation of the monastery of Kildare at the site of the older nemed of the goddess Brigid, the foundation of Armagh at the older assembly site, and the foundation of Iona by Columba are all examples of this process. The result was a Christian sacred landscape that was deeply rooted in the older pagan geography, and that preserved, often in transformed form, the older tradition of pilgrimage to particular holy places.
Related Topics
- The Celtic gods and goddesses worshipped at the sacred sites are examined in detail, with attention to their regional variations and iconography.
- The Druids and the priestly class who performed the rites at the sacred sites are explored in detail, with attention to their training and functions.
- The Celtic cosmology and the Otherworld with which many of the sacred sites were associated are explored through mythology and folklore.
- The history of the Celtic civilization places the sacred sites in their chronological and political context.
- The legacy of Celtic mythology today shows how the older sacred geography continues to inspire modern interest in Celtic spirituality.