The Druid Latin word utilising Julio Cesar in the Gallic wars to designate the French priests and Celtic depositaries of sacred and profane knowledge and influential social and political, devoted to education, the interpretation of dogma, to the administrative administration of Justice, to the omens and the cult. According to Robert Graves, the Romans probably took the floor of the ancient languages Celtic in which derwydd means the seer of the oak. Others speak of Dryads, the Greek nymphs of oak trees.