Charles Godfrey Leland in the context of "Stregheria"

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. Historians and folklorists have disputed the existence of such a group. During the 20th century, the book was influential in the development of the contemporary Pagan religion of Wicca.

Aradia is one of the principal figures in the American folklorist Charles Godfrey Leland's 1899 work Aradia, or the Gospel of the Witches, which he believed to be a genuine religious text used by a group of pagan witches in Tuscany, a claim that has subsequently been disputed by other folklorists and historians. In Leland's Gospel, Aradia is portrayed as a messiah who was sent to Earth in order to teach the oppressed peasants how to perform witchcraft to use against the Roman Catholic Church and the upper classes.

The folklorist Sabina Magliocco has theorized that prior to being used in Leland's Gospel, Aradia was originally a supernatural figure in Italian folklore, who was later merged with other folkloric figures such as a Rejusta of Sardinia.