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
Greek mythology mythology to the indigenous pre-Greek societies: Crete, Mycenae, Pylos, Thebes and Orchomenus. Historians of religion were fascinated by a number of apparently ancient configurations of myth connected with Crete (the god as bull, Zeus and Europa, Pasiphaë who yields to the bull and gives birth to the Minotaur, etc.). Martin P. Nilsson asserts, based on the representations and general function of the gods, that a lot of Minoan gods and religious conceptions were fused in the Mycenaean religion. and concluded that all great classical Greek myths were tied to Mycenaean centres and anchored in prehistoric times. Nevertheless, according to Burkert,