Aradia, or the Gospel of the Witches is a book composed by the American folklorist Charles Godfrey Leland that was published in 1899. It contains what he believed was the religious text of a group of pagan witches in Tuscany, Italy that documented their beliefs and rituals, although various historians and folklorists have disputed the existence of such a group. In the 20th century, the book was very influential in the development of the contemporary Pagan religion of Wicca.