The incubus, also called “follet” in French, “alp” in German, “duende” in Spanish, and “folletto” in Italian, was an angel who fell because of lust for women according to many of the Church Fathers. This being appears to women often in the form of a sexual dream/nightmare, and in fact the Latin word for nightmare is “incubo”, meaning to lie upon. Its counterpart is the succubus, who appears to males. When a witch or sorcerer is associated with it, it is called a magistellus or familiar.