Ancient Worlds: But Is It True?

Before we go any further in the discussion of the origins of fantasy and science fiction in ancient literature, I wanted to address a basic question:
Did the Greeks believe any of this was true?
When we sit down to read a work of fantasy, we are very aware of reading about a constructed space. We know we are temporarily inhabiting an imagined world, and much of our delight comes from that work of imagination. Our appreciation of any verisimilitude comes attached to that sense of creation: it is exciting to us that the work we are reading is believable even though it is pretend.
(This is, of course, what non-geeks often don’t understand about those of us of the geekly persuasion. How, they wonder, can you spend so much time arguing over the minutiae and plot holes of a story in which a basic premise is “we live in space and , even more unbelievably, do without money”? The answer is that even a pretend world needs internal consistency, and we argue because tolerances on that consistency vary. I can’t stop tearing my hair out at the messed up timeline of Disney’s Beauty and the Beast, my husband thinks this is hilarious, I love him anyway.)