Medusa part of their religion. Medusa was beheaded by the hero Perseus, who thereafter used her head, which retained its ability to turn onlookers to stone, as a weapon until he gave it to the goddess Athena to place on her shield. In classical antiquity the image of the head of Medusa appeared in the evil-averting device known as the "Gorgoneion". The three Gorgon sisters—Medusa, Stheno, and Euryale—were all children of the ancient marine deities Phorcys (or "Phorkys") and his sister Ceto (or "Keto"), chthonic monsters from an archaic world. Their genealogy is shared with other sisters, the Graeae, as in
Bangs Sisters blank letter sealed between two slates and writing a reply which they would pretend a spirit had written. Hereward Carrington who sat with the sisters in 1909 found their slate-writing to be fraudulent. He had also set up a trap by inventing a fictitious mother named "Jane Thompson" in a sealed letter. He received a reply signed by Jane from the sisters. Psychical researcher Paul Tabori noted that Carrington "also analysed their way of producing 'spirit paintings' or 'portraits'. The ladies simply substituted one canvas for another, under the cover of their voluminous dress, the table or window-curtains." The Bangs