I read a short paragraph on Medusa's wikipedia page about the myth representing a historical event.
A number of early classics scholars interpreted the myth of the Medusa as a quasi-historical - "based on or reconstructed from an event, custom, style, etc., in the past", or "sublimated" memory of an actual invasion.
As I understood it, a Joseph Campbell suggests a temple with priestesses wearing gorgon masks, essentially, was invaded by King Perseus' Hellenes around 13th century BC, which would have been Mycenaean Greece I guess.
Is there any more info of this? Is anything known about these ancient snake priestesses/godesses/religions? How far back could this go? Proto-Indo-European, even? Or was she just based on a very early greek goddess/cult that was discarded?