This idea has always been very strange to me. The first time I encountered this idea was when I was required to read about the Euthyphro Dilemma in college. It felt like a whole dialogue about something that was obviously false. The dilemma being about whether "For something to be good means that that something is loved by the gods". Just struck me as a bizarre idea, and I didn't understand why anyone would think that. The natural sequence seemed to me that there is this idea of goodness... and since gods are supposedly good and want goodness... they would love things that are good. The notion that "to be loved by the gods" is the meaning of "good" itself made no sense to me. It seemed like Plato constructed this bizarre idea that was obviously false... then spends an entire dialogue discussing why the idea is problematic, when nobody in their right mind would think of it in the first place.
But this idea seems extremely popular in Western popular culture, and at least amongst Christian philosophers. I'm wondering what the initial source of this idea is. Is it the Euthyphro Dilemma itself? For example: did Plato came up with this notion?
Or has it occurred before that in either Western philosophy or other philosophies?
Also, is this actually a natural idea? The Socratic dialogues usual concerns "natural" assumptions which upon further examination turn out to be problematic... But to me this idea seems completely unnatural and only something a very clever philosopher could come up with in the first place. But maybe I'm an outlier in this regard.