Michael Zevaco's the Pardaillan Volume vi "Fausta's Wrath"

Fausta was an Italian Princess, who had love affairs with the rich and powerful. One of her lovers was a Cardinal, and convinced her to come to a secret conclave of Cardinals where she was elected Popess. Her Paris' palace was discretely connected to an inn where she hosted bacchanals and orgies incognito with the Parisian high society, only to blackmail them later. Violet was born from Eleanor, a protestant, whose Catholic lover abandoned her. She discovered that the bishop celebrating mass at Our Lady was him, and confronted him during the Eucharist ritual. The congregation seized her and took her to jail. Found guilty six months later for spreading malicious gossips against the bishop, she was sentenced to death by hanging. Now hanging by the neck in the gallows, she let out frightening shouts not of death but of labor. A creature fell. Everyone believing it to be the devil's daughter, nobody wanted it. She was Violet. Find out the end of all this madness of Fausta's Wrath!