The Devil's Dictionary: Druids
Priests and ministers of an ancient Celtic religion which did not disdain to employ the humble allurement of human sacrifice. Very little is now known about the Druids and their faith. Pliny says their religion, originating in Britain, spread eastward as far as Persia. Caesar says those who desired to study its mysteries went to Britain. Caesar himself went to Britain, but does not appear to have obtained any high preferment in the Druidical Church, although his talent for human sacrifice was considerable.
Druids performed their religious rites in groves, and knew nothing of church mortgages and the season-ticket system of pew rents. They were, in short, heathens and - as they were once complacently catalogued by a distinguished prelate of the Church of England - Dissenters.