The legend of Perseus beheading Medusa means, specifically, that "the Hellenes overran the goddess's chief shrines" and "stripped her priestesses of their Gorgon masks", the latter being apotropaic faces worn to frighten away the profane. That is to say, there occurred in the early thirteenth century B.C. an actual historic rupture, a sort of sociological trauma, which has been registered in this myth, much as what Freud terms the latent content of a neurosis is registered in the manifest content of a dream: Registered yet hidden, registered in the unconscious yet unknown or misconstrued by the conscious mind.      — J. Campbell (1968)