A druid (, from Proto-Celtic , 'oak-knower' or '[priest with] strong insight'); ; . was a member of the learned class of the ancient Celtic peoples of Gaul and Britain, described by Greek and Roman writers as a priest, teacher, judge and custodian of religious and legal tradition. Because the druids committed nothing of their teaching to writing and cannot be securely identified in the archaeological record, almost everything known about them comes from outside observers.
Classical authors placed the druids only in Gaul and Britain, never among the other Celtic-speaking peoples. The earliest notices, of the 4th and 3rd centuries BCE, treat them as 'barbarian' philosophers akin to the Persian magi and the Indian gymnosophists. Much of the surviving material descends from the lost ethnography of Posidonius, and the fullest account is that of Julius Caesar, whose reliability has long been debated. The druids were credited with teaching the immortality of the soul and with officiating at sacrifices. The familiar modern image of white robes, oak groves, mistletoe and a golden sickle derives largely from a single passage of Pliny the Elder.
The druids declined after the Roman conquest of Gaul and were the object of imperial prohibitions in the 1st century CE, after which they faded from the Continental record. In Ireland, which Rome never reached, and more rarely in Wales, medieval literature preserves many druids, but these accounts are now generally read as literary constructs of their Christian authors rather than as reliable evidence for pre-Christian religion.
From the 16th century onward the druids became a screen for successive reinterpretations: noble monotheist philosophers of Renaissance humanism, the supposed builders of Stonehenge, bards of the Romantic imagination, and, in the present day, figures of a modern Druidry and Celtic neo-paganism that has no genuine continuity with the ancient priesthood. Modern scholarship accepts the druids as a real priestly and learned order of the Iron Age Celts, while stressing how little about them can be established with confidence.
Etymology The modern English druid comes from French druide, itself from Latin *druida (found only in plural, druides), certainly borrowed from Gaulish druides. The Gaulish word is cognate with Old Irish druí (pl. druíd, 'magician, wizard') and Middle Welsh dryw ('seer').; ; ; . In both Irish and Welsh, druí and dryw could, in certain contexts, also denote the wren, a bird regarded as prophetic in these traditions. Middle Welsh derwydd ('seer') and Old Breton dorguid ('prophetic, magical') represent parallel formations.
All these forms stem from a Proto-Celtic noun reconstructed as *druwids (pl. *druwides).; ; . The second element is generally derived from the Proto-Indo-European (PIE) verb *weyd- ('see, know'). The origin of the first element was debated in the first part of the 20th century,; ; . but now most scholars trace it to PIE *derw- ≈ *dru- ('oak'), which metaphorically also meant 'strong, firm'.; ; ; ; ; .
On this basis, the Celtic compound *druwids has been variously interpreted as 'oak-knower, well versed in oaks',; ; 'knower of trees', possibly 'knower of the world-tree', or as the priest with 'strong insight'. Pliny the Elder had already offered a folk etymology deriving druid from Greek drŷs ('oak') in the 1st century CE. An older interpretation, advanced by Rudolf Thurneysen in 1893, interpreted the first element as an intensive prefix, yielding the meaning 'the very wise'. Although Thurneysen himself retracted it in 1927, this older reading continues to appear occasionally in popular literature.
Sources
The druids left no records of their own, so knowledge of them rests on Greek and Roman testimony, supplemented with caution by later insular literature and by archaeology. Between the 4th century BCE and the 4th century CE some twenty classical authors referred to the druids of Gaul and Britain. The archaeologist Stuart Piggott distinguished two strands in the classical image of the druids: a 'Posidonian' tradition, often unfavourable and stressing sacrifice, and an 'Alexandrian' tradition of soft primitivism that presented them as noble sages of a golden age.
Posidonius
Much of the 1st-century material descends from the lost Celtic ethnography of the Stoic philosopher Posidonius of Apamea (c. 135–51 BCE), who visited Massalia around 100–90 BCE. Diodorus and Strabo drew on him directly, and Ammianus did so through Timagenes. Most modern commentators accept that Caesar too drew on Posidonius, although Caesar also possessed extensive first-hand knowledge of Gaul, and his account contains much found in no other source.
The relationship between these texts has been much debated. In 1960 J. J. Tierney attempted to reconstruct Posidonius's ethnography from later authors, arguing that Caesar had taken most of his account from Posidonius and had exaggerated the power of the druids for political reasons. Tierney further held that the druids' medico-magical role was the real basis of their standing and that their reputation for philosophy was a mere ideological superstructure. Daphne Nash provided a comprehensive refutation in 1976, arguing for the originality of Caesar's account. Following the work of Ian Kidd, classicists have adopted a minimalist approach to Posidonian attribution, cautioning against tracing every later notice to his lost history.
Building on this, Jane Webster argued in 1999 that, because Posidonius wrote about the Marseille littoral a generation after its annexation whereas Caesar wrote about a Gaul not yet conquered, the socio-political features found only in Caesar (a supra-tribal order, judicial arbitration, an annual assembly, a British origin, and exemption from tax and military service) are precisely those to be expected of pre-conquest druids. On this reading it is not Caesar but his later borrowers, Diodorus, Timagenes and Strabo, who are anachronistic, since they projected an out-dated ethnography onto the Gaul of their own day.
Other Graeco-Roman accounts
The earliest references present the druids as barbarian philosophers. Diogenes Laërtius (3rd century CE) reports that the druids and Semnotheoi of the Celts and Galatai were counted among the founders of philosophy, a notice he traces to the lost Magikos attributed to Aristotle and to the Successions of Philosophers of Sotion (2nd century BCE).Diogenes Laërtius, Vitae 1.1, citing the Magikos attributed to Aristotle and the Successions of Sotion.
The first substantial descriptions belong to the 1st century BCE. Diodorus Siculus, Strabo and, in the fullest form, Julius Caesar, describe the druids among the peoples of Gaul.Diodorus Siculus, Bibliotheca historica 5.31.2–5. Strabo, Geographica 4.4.4–5. Julius Caesar, De Bello Gallico 6.13–14; 6.16; 6.18.; Cicero, a contemporary, records that he had personally known a Gaulish druid, Diviciacus of the Aedui.Cicero, De Divinatione 1.90. Diviciacus is the only druid known as an individual from other contexts, and Cicero may have placed material drawn from Posidonius in his mouth.
Under the early empire the geographer Pomponius Mela describes druidic teaching conducted over twenty years in caves or remote groves,Pomponius Mela, De Chorographia 3.2.18–19. while Pliny the Elder gives an account of the cutting of mistletoe and records Roman measures against the druids.Pliny the Elder, Naturalis Historia 16.249–251; 30.13. The poet Lucan addresses the druids on the immortality of the soul and names three gods propitiated by blood.Lucan, Bellum civile 1.444–446; 1.450–458. Tacitus provides the only notice of druids in Britain, at the Roman assault on Mona (Anglesey), and reports a druidic prophecy after the burning of the Capitol in 69 CE.Tacitus, Annals 14.30; Histories 4.54. In late antiquity Ammianus Marcellinus, drawing on the Augustan historian Timagenes, again groups the learned Gauls into three orders.Ammianus Marcellinus, Res gestae 15.9.8, citing Timagenes. The Historia Augusta reports encounters between 3rd-century emperors and Gaulish druidesses, episodes generally regarded as literary invention.Historia Augusta, Alexander Severus 60.6; Aurelian 44.4; Numerian 14.
What these authors report about the druids is unevenly distributed. For those writing between the 1st century BCE and the 1st century CE, Jean-Marie Pailler has set it out in tabular form, a tick marking a feature an author ascribes to the druids, a question mark a doubtful attribution, and a blank the author's silence. +Features attributed to the druids by the classical authors, after Pailler (2008)AuthorScholarsSeersMagicMediatorsSacrificesArbitersPunishmentTeachingSingle headSecluded placesBritainPosidonius✓✓?✓✓?✓????Diodorus Siculus✓✓✓✓✓Cicero✓✓✓Caesar✓✓✓✓✓✓✓✓✓StraboPomponius Mela✓✓✓LucanPliny the Elder✓✓✓
Ancient druids
Functions and social role
Classical authors were most struck by the druids' elevated standing. The orator Dio Chrysostom likened their power to that of the Persian magi, the priests of Egypt and the Indian Brahmins, saying that kings could decide nothing without them.Orationes 49 Diodorus and Strabo, drawing on Posidonius, describe the druids arbitrating public and private disputes and even halting armies drawn up for battle.
Caesar's account is the most detailed and the most discussed. He presents the druids as one of the two honoured classes of Gaul, alongside the equites ('horsemen'). According to Caesar, they conducted public and private sacrifices and expounded religious questions, judged nearly all disputes over crime, inheritance and boundaries, and could exclude the disobedient from sacrifice, the harshest of penalties. They had a single head who held office for life. Once a year they assembled at a consecrated place in the territory of the Carnutes, reckoned the centre of all Gaul. They were exempt from taxation and military service, and trained pupils who might remain in instruction for up to twenty years, memorising a great body of verse. Although they held it unlawful to commit their doctrine to writing, they used the Greek alphabet for other purposes, and their teaching was said to have originated in Britain.De Bello Gallico 6.13–14
Caesar's value as a source has been much debated. Ronald Hutton has emphasised that, although Caesar makes the druids a major power in Gaul, they are absent from his narrative of the conquest and from his account of the British expeditions, appearing only in his self-contained survey of Gaulish society, a silence shared by his literary continuator Aulus Hirtius (not to be confused with Aulus Plautius who led the Roman invasion of Britain in 43 CE). Hutton reads the portrait as shaped to Caesar's ends, the druids being learned enough to make Gaul worth annexing, organised enough to pose a political threat, and barbaric enough to make its conquest a work of civilisation. Jean-Marie Pailler has emphasised that Caesar confines the druids to the excursus and says almost nothing of them in the campaign narrative, so that even Diviciacus, whose dealings he reports at length, is nowhere called a druid, a status known only from Cicero. Pailler suggests further that the druids may have been the first to conceive the idea of a unified Gaul, which Caesar afterwards made his own. Sean Dunham and Bernhard Maier have argued that most of the functions Caesar ascribes to the druids are in fact those of the Roman senatorial priesthoods, projected onto an alien people. Maier further notes that Caesar assimilated the druids to the college of pontifices, and that his statement that the Germans had no druids served his presentation of the Rhine as a natural frontier. Miranda Aldhouse-Green, by contrast, holds Caesar's account to be the richest and one of the most reliable, judging it inherently unlikely that he invented a fictional class system for peoples on whom other Roman officers were also reporting.