Theia Mania

Graves had some quite imaginative interpretations, as I recall.

His premise was in the subtitle of _The White Goddess_ - a historical grammar of poetic myth. He had a sense of the deep history and pre-history of the early known world and of how cultures overlaid themselves and absorbed or replaced earlier cultures. I've seen enough anthropological and archaeological material that I can give his readings some credence, especially of the material from the eastern Mediterranean, based on the known waves of migration passing through. Classical Greek culture did indeed overlay earlier cultures, and therein lies a prime example of Nietzsche's "transvaluation of values"; Graves pivoted much of White Goddess around that point.

I've only read the book The Greek Myths and that was many years ago, but I remember some of his personal interpretations as quite weird. Most classic scholars also seem to dislike them. But you are of course right that the ancient Greeks were influenced by other cultures.