An icebreaker
Roman writers described druids as judges, teachers, and priests among the ancient Celts, though modern historians doubt how much those outsiders truly understood. Since the 1700s, a separate revival movement has built its own Druidry from scratch, openly modern and centered on nature.
In his account of the Gallic wars, he described druids as overseeing sacrifice, teaching, and judging disputes among the Gauls, a portrait modern historians read as shaped partly by Rome's own political interests.
In his natural history, he described druids gathering mistletoe with a golden sickle in a ceremony honoring the plant's sacred status, one of the few surviving details of druidic ritual practice from antiquity.
In his history of the druids in Britain, he traced how little is reliably known of the ancient priesthood and how thoroughly the 18th-century revival, especially through one influential Welsh forger, reinvented druidry as something new.
Reviving and expanding a Druid teaching order from the late 1980s onward, he has presented modern Druidry as a nature-centered spiritual path for the present, openly distinct from any claim of unbroken ancient descent.