"The Illustrated Book of Science Fiction Lists" by Mike Ashley suggests the following ten candidates for earliest SF works:
1) 'The Epic of Gilgamesh' - c.2100 BC
2) 'The Odyssey', Homer - c.750 BC
3) 'The Birds', Aristophanes - 414 BC
4) 'Timaios' and 'Critias', Plato - c.350 BC
5) 'Heliopolis', Iamboulos - c.260 BC
6) 'The Argonautica', Apollonios - c.250 BC
7) 'Somnium Scipianus', Marcus Cicero - 45 BC
8) 'Facies in Orbe Lunare', Plutarch - c.100 AD
9) 'Of Marvels Beyond Thule', Antonius Diogenes - c.100 AD
10) 'Alethes Historia', Lucian of Samosata - c.170 AD
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