In Ancient Greece, the Gorgoneion (Greek: Γοργόνειον) was a special apotropaic amulet showing the Gorgon head, used by the Olympian deities Athena and Zeus: both are said to have worn the gorgoneion as a protective pendant, and often are depicted wearing it. It established their descent from earlier deities considered to remain powerful. Among other attributes, it was assumed by rulers of the Hellenistic age as a royal aegis to imply divine birth or protection, as shown, for instance, on the Alexander Mosaic and the Gonzaga Cameo.
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