Druids without druid sources
Everything detailed that we know about the druids was written by Greeks and Romans, and none of it was written by a druid. According to Julius Caesar, the druids themselves deliberately avoided committing their teachings to writing and relied on memory, so nothing in their own words has survived. That makes Roman accounts of druids a special kind of evidence: valuable, because they are the only ones near the time, but filtered through outsiders who often wrote for Roman readers and with Roman aims in mind. Archaeology has not found anything that can be firmly labelled a druid’s grave or tools, though some burials with unusual ritual or medical equipment have been suggested as candidates.
The earliest Greek reports
The earliest descriptions probably go back to the Greek philosopher Posidonius, who travelled in Gaul around 100 BCE. His own work is lost, but later writers such as Diodorus Siculus and Strabo appear to draw on it. Strabo says there were three groups of honoured men among the Gauls: bards, who sang praise and satire; vates, who performed sacrifices and studied nature; and druids, who studied natural philosophy and ethics and acted as judges. Diodorus adds that druids were compared with Pythagorean teachers, because they taught that souls survive death.
These descriptions are shaped by Greek habits of thought. Greek authors liked to find “philosophers” among distant peoples, and may have described the druids to fit that pattern. The comparison with Pythagoras tells us as much about Greek interests as about Gaul.
Earlier Greek explorers also wrote about the north. The Pytheas voyage of the fourth century BCE gave Mediterranean readers some of their first reports of Britain, but his own text survives only in quotations, and druids are not mentioned in what remains.
Caesar
Caesar’s Gallic War, written in the 50s BCE, is the fullest account. In book six he explains that Gaul had two ruling classes, the druids and the knights. Druids, he says, oversaw sacrifices and religious matters, judged disputes, and could exclude people from rites as a punishment. They were exempt from war service and taxes, which attracted many young men. Training could last up to twenty years and was done by memorising verses. They met once a year at a sacred place in the territory of the Carnutes. Caesar also says their doctrine was thought to have originated in Britain, and that they taught that souls pass from one body to another.
The same chapters describe human sacrifice, including the burning of captives in huge wicker figures. Caesar had reasons to emphasise it. His account was written to justify the conquest of Gaul to a Roman audience, and a priesthood that ordered human sacrifice made the Gauls look barbaric and Rome’s intervention righteous. He may have exaggerated, and he certainly reported second-hand. Yet the claim agrees in part with other classical writers and with some archaeological finds from sanctuaries, so it should not be dismissed outright either.
His narrative also complicates the idea of a unified priesthood. He mentions rulers and leaders such as Diviciacus of the Aedui, who is usually taken to have been a druid, in political and military roles. Cicero, who knew Diviciacus, describes him as an expert in natural philosophy and divination. That suggests that “druid” could mean a learned advisor with wide influence, not only a priest.
Pliny the Elder
Pliny, writing in the first century CE, describes a ceremony that has become famous. When a druid found mistletoe growing on an oak, a white-robed priest climbed the tree, cut the plant with a golden sickle and caught it in a white cloak, after which two white bulls were sacrificed. The mistletoe was believed to cure many ills and make animals fertile. Pliny also relates a charm involving a “serpent’s egg” that druids supposedly prized as a lucky token for winning legal cases.
Pliny’s reliability is mixed. He was a compiler who gathered information from many sources, and his Natural History is full of unverified claims. He may be drawing on an earlier source, or on rumour. He also reports that the Emperor Tiberius suppressed the druids and the class of “seers and doctors” in Gaul. The word doctors points to the herbal and healing skills that Romans linked with them, an area that overlaps with ancient herbal remedies in other cultures. Mistletoe is toxic if eaten, so the ancient claims are not a guide to use.
Suetonius adds that Claudius abolished the cruel druidic religion in Gaul. These two measures may suggest that Roman policy was aimed at a religious class that could unite local leaders against the empire, though the sources do not say so directly.
Tacitus and Anglesey
The most dramatic passage is Tacitus’s account in the Annals of the Roman attack on the island of Mona, modern Anglesey, in about 60 CE. The governor Suetonius Paulinus led his troops across the strait against a base of resistance. Tacitus describes a line of warriors, women in black robes with torches, and druids raising their hands and calling down curses. The Roman legions and their auxiliaries, in his telling, hesitated before pressing on and destroying the sacred groves, which Tacitus says were used for cruel rites with human blood.
The passage is vivid, but its limits are plain. Tacitus was writing decades later and was related by marriage to Agricola, a young officer who had served under Paulinus. The tale served his picture of Roman virtue and the danger of superstition. It also notes that the attack was interrupted by news that the Iceni under Boudica had revolted. Archaeology at Llyn Cerrig Bach on Anglesey, where metalwork was thrown into a lake, shows that the island was a ritual centre, though not that the Tacitus story happened exactly as told.
Tacitus also reports in the Histories that after the burning of the Capitol in 69 CE, druids in Gaul claimed it was a sign that rule of the world would pass to peoples north of the Alps. His point is that druids were still active as a source of political prophecy.
Why the sources have a political edge
Reading these authors together, several patterns stand out. Roman writers had to explain Roman expansion to their readers, and the druids provided a convenient group of fanatical priests. The authors also borrowed from each other and from older Greek stereotypes of the wise and the savage barbarian. Rome treated priesthoods that organised resistance as threats, and that may explain the bans. Even so, they also reported with a certain admiration, which suggests the druids really were respected figures.
The modern druid
The picture of the white-robed druid at Stonehenge comes mostly from the seventeenth and eighteenth centuries. Stonehenge was built thousands of years before the Iron Age, and nothing links it to the druids of the classical authors. Modern druid groups date from the eighteenth century onward and openly draw on imagination as much as evidence. The honest historical record of the druids is thin, political and second-hand, but it still shows a real class of learned men who mattered in Celtic society.