One of the challenges which confronted Roman imperialism in Western Europe was defeating the Druidic priesthood. It was a spiritual war rather than a war of weaponry. Over time, the Romans were so successful that they erased the deeply entrenched Druidic system from memory. There is almost no knowledge of their traditions left today.
On the Druid Wikipedia page, you will find a good deal of information of how important and widespread this culture was from the British Isles, France (Gaul), Spain, Cisalpine Gaul, and vicinities; and why the Romans wanted to eliminate it. Also, YouTube has some interesting videos on it, and attempts to revive it. There are Druids today, but they have little to go on. Although largely identified with males, there seem to have been Druidic priestesses. As far as how the Druidry overlapped with the culture of witchcraft within the Celtic world, we don't know as yet. Unlike the rest of the Celtic world, the worship of Cernunnos, or Witchcraft, seemed to have been just as strong as Druidry in Cisalpine Gaul.
Free eBooks (Can Be Downloaded):
Reynold Nicholson - The Mystics Of IslamJohn Musick - The Witch Of Salem
John Earle - The Deeds Of Beowulf
