Druidism refers both to the religion of the druids, the learned priestly class of the ancient Celtic peoples of Gaul, Britain and Ireland, and to modern Druidry, a spiritual movement that began in the eighteenth century. Almost nothing written by ancient druids survives, so knowledge of them depends on Greek and Roman authors, archaeology and later Irish and Welsh literature.
Druidism at a glance
| Region | Gaul, Britain and Ireland |
|---|---|
| Active period | About the 4th century BCE to the early centuries CE |
| Main ancient sources | Julius Caesar, Pliny the Elder, Tacitus, other classical writers |
| Roman suppression | Measures under Tiberius and Claudius; attack on Anglesey in 60 or 61 CE |
| Modern revival | From the 18th century; Ancient Order of Druids founded 1781 |
| Major modern group | Order of Bards, Ovates and Druids (founded 1964) |
The ancient druids
The druids were a learned elite among the Celtic-speaking peoples. The fullest ancient description comes from Julius Caesar, who campaigned in Gaul in the 50s BCE. In his Gallic War he wrote that druids presided over sacrifices, interpreted religious questions, educated young men and acted as judges in disputes. They were exempt from military service and taxes, gathered annually at a sacred site in the territory of the Carnutes, and memorized a large body of verse instead of committing their teachings to writing, a training that could reportedly last twenty years.
Caesar also said that druids taught that souls do not perish but pass after death into other bodies. Some Greek and Roman writers compared this teaching to the ideas of Pythagoras (see Pythagoreanism), though how closely the beliefs resembled each other is unknown.
Rituals, groves and sources
The most famous image of druid ritual comes from Pliny the Elder, who described druids in white robes cutting mistletoe from an oak with a golden sickle, followed by the sacrifice of two white bulls. Classical writers associated druids with sacred groves, and several, including Caesar, accused them of human sacrifice. Modern historians treat these accounts with caution: the authors were outsiders, sometimes writing propaganda to justify conquest, and archaeological evidence for Iron Age ritual killing is real but difficult to link specifically to druids.
Later sources add a different picture. Medieval Irish literature, written by Christian monks, depicts druí as advisers, seers and poets in royal courts, and Welsh tradition preserved figures of bards and prophets. These texts preserve older memories but also reflect their authors' own times, so they cannot be read as direct records of pre-Christian religion. Archaeology adds sanctuaries, votive offerings and bog bodies, but none of these can be tied to druids with certainty (see Celtic mythology).
Roman suppression and decline
Rome tolerated many local religions but treated the druids as a political threat. Ancient writers report that the emperor Tiberius acted against them and that Claudius suppressed druidism in Gaul. In Britain, Tacitus describes the Roman general Suetonius Paulinus attacking the island of Mona (Anglesey) in 60 or 61 CE, where druids stood among the defenders raising their hands to the sky and calling down curses before the Romans cut down the sacred groves. Druids faded from Gaul and Britain under Roman rule and later Christianization, though in Ireland, never conquered by Rome, the class survived longer before merging into the roles of poets and lawyers.
The druid revival
Renewed interest began in the seventeenth and eighteenth centuries, when antiquarians such as John Aubrey and William Stukeley linked druids to Stonehenge and other megaliths. Archaeology has since shown that these monuments were built thousands of years before the druids are recorded, but the association has endured in popular imagination.
Fraternal and cultural societies followed. The Ancient Order of Druids, founded in London in 1781 and influenced by Freemasonry, became a friendly society. In Wales, Edward Williams, known as Iolo Morganwg, held a gathering of bards on Primrose Hill in London in 1792 that became the Gorsedd, now part of the National Eisteddfod. Iolo was a gifted poet and scholar, but he also forged documents he claimed were ancient, and much of what later groups believed about druid teaching came from his inventions.
Modern Druidry
In the twentieth century Druidry developed into a spiritual path, often counted among modern Pagan religions alongside Wicca (see Gerald Gardner). The Order of Bards, Ovates and Druids, founded by Ross Nichols in 1964, became the largest organization, and Ár nDraíocht Féin, founded in the United States by Isaac Bonewits, emphasized scholarship drawn from wider Indo-European sources. In 2010 the Druid Network was registered as a charity in England and Wales, a notable step toward official recognition.
Modern Druids generally honor nature as sacred, celebrate the eight festivals of the wheel of the year (see sabbats), and gather at solstices at sites such as Stonehenge. Most openly acknowledge that their practice is a modern creation inspired by the past rather than an unbroken survival of ancient religion. Beliefs vary widely, ranging from polytheism and animism to more philosophical or cultural approaches.
Related entries
Frequently asked questions
Did the druids build Stonehenge?
No. Stonehenge was built in phases from around 3000 BCE, long before the druids appear in historical records during the Iron Age. The link between druids and Stonehenge was popularized by seventeenth- and eighteenth-century antiquarians such as John Aubrey and William Stukeley. Modern Druids still gather there at the solstices, but as a modern tradition.
Did ancient druids practice human sacrifice?
Several Greek and Roman writers, including Julius Caesar, claimed that they did. Historians are cautious because these authors were hostile outsiders, and some wrote while Rome was conquering the Celtic lands. Archaeology shows that ritual killings did occur in Iron Age Europe, but connecting particular cases directly to druids remains uncertain.
Is modern Druidry a religion?
For many practitioners it is. Modern Druidry is usually classed as a form of contemporary Paganism focused on reverence for nature, seasonal festivals and creativity. Some Druids are polytheists or animists, while others treat it as a philosophy compatible with other faiths. In England and Wales, the Druid Network gained charitable status in 2010.
Sources and further reading
This entry replaces an article from the original Mystica encyclopedia (online since 2001). It was rewritten from the sources above by The Mystica Editorial Team under our editorial standards. Last reviewed: September 30, 2026.