or the Gospel of the Witches
By C.G. Leland
Published in 1899 Aradia or The Gospel of the Witches, was as claimed by Leland the central religious text of a relict group of witches practicing an ancient pagan religion revering Diana (Aradia) in Northern Italy. Leland professed to be in contact with the leader of these witches, from whom he received the Gospel, and translated it into English. No proof of this group or their leader was ever given by Leland and none has been discovered since.
However, the book was wildly popular and was cited by academic M.A. Murray as proof of her Witch-Cult Hypothesis in The Witch-Cult in Western Europe. And more significantly used by the founder of Wicca, Gerald Gardener, as inspiration for his own reconstruction of the ancient faith of Witches.
Aradia is a must read for all students of modern witchcraft.