Ancient Druids appear in classical accounts of parts of western Europe. Their name was later taken up by antiquarians, literary societies and modern religious groups. The sources for those histories are different. A Roman description of Gaul tells us how an outsider portrayed Druids. Records of a Welsh ceremony or of a modern order show how later people used and developed the name.

What Roman writers say about ancient Druids
Julius Caesar’s Gallic War describes Druids in Gaul as people who conducted religious rites, taught pupils and settled disputes, including disagreements about inheritance and boundaries. He says pupils memorized many verses and that the Druids kept those teachings oral even though they used Greek letters for other purposes. That detail makes a distinction between a way of transmitting particular teachings and the wider use of writing. The account comes from a Roman commander writing about the society in which he was campaigning. Caesar, Gallic War 6.13–14.
Pliny the Elder gives a different kind of account in his Natural History. He describes a ceremony in which mistletoe was cut from a tree with a golden sickle. His passage is one reason this scene is associated with ancient Druids. It gives a particular account of an observance, while a reconstruction of the full religious life of the communities involved would require other evidence. Pliny, Natural History 16.95, English text.
Roman conquest and the account of Mona
In his Annals, Tacitus describes Roman troops attacking Mona, now Anglesey, around 60 CE. He portrays Druids lifting their hands and uttering curses on the shore. He then describes the Romans destroying groves after the battle. The sequence is evidence of how a Roman historian presented a campaign and its violence. The record gives a particular place and confrontation, leaving open how local practices changed elsewhere and what people passed on in later centuries. Tacitus, Annals 14.29–30. Museum Wales, Iron Age resource.
How Stonehenge became associated with Druids
In 1740 the antiquarian William Stukeley published an argument that Druids had built Stonehenge. English Heritage’s collection traces the influence of that interpretation and describes later friendly societies adopting images of the monument on items such as ceremonial sashes. Archaeological work places the main sarsen stones around 2500 BCE, long before the Roman accounts of Druids. The monument and the later objects therefore provide evidence for separate histories. One concerns the Neolithic building, and the other concerns the way later groups came to identify with it. English Heritage, the history of interpretations of Stonehenge. English Heritage, archaeological account of Stonehenge.
A Welsh literary revival and modern religious orders
Iolo Morganwg organized the first ceremony of the Gorsedd of the Bards of the Isle of Britain at Primrose Hill in London in 1792. Museum Wales traces its connection with the Welsh Eisteddfod to Carmarthen in 1819 and identifies a sword used in that ceremony. The Gorsedd’s Welsh-language pageantry gives druidic and bardic imagery a documented place in the history of literature and public ceremony. Museum Wales, history of the Gorsedd. Museum Wales, the Carmarthen Eisteddfod of 1819.
Modern religious Druidry has its own organizations. The Order of Bards, Ovates & Druids dates its formation under Ross Nichols and colleagues to 1964. It describes local groups gathering to mark seasonal festivals or occasions such as naming a child, marriage or death. The British Druid Order gives 1979 as its founding date and describes drawing on archaeology, literature, folklore and personal spiritual experience. These accounts show how two groups have developed religious practices using several kinds of source. Order of Bards, Ovates & Druids, account of its founding. Order of Bards, Ovates & Druids, gatherings. British Druid Order, its origins and influences.
Conclusion
Ancient Druids are known through partial accounts from outsiders. Later records let us follow particular developments more closely, from Stukeley’s interpretation of Stonehenge to the ceremonies of the Gorsedd and the formation of modern orders. This evidence explains where different practices and images came from and why they carry different meanings for the people who use them.
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