HBO picks up George RR Martin series - Game of Thrones
I mean a dragon isn’t necessarily supernatural. Although with knowledge of physics flight would be pretty much impossible beyond a certain size. Definitely well below carrying a human rider
Again, we're forced to return to the extent of how much even ancient highly-educated Greco-Roman, Persian, Jewish, or Egyptian scientists, naturalists, or philosophers really knew or understood as absolute fact about hard sciences, exotic animal and plant species they werent even aware existed on three seperate continents (North and South America, Antarctica) completely unknown and would remain that way for another 1,500 years and in Antarctica's case, not until the late 18th century was it actually "discovered" supposedly by a Russian commercial admiral.
I'm sure naturalists or philosophers like Pliny the Elder, Cato, Socrates or Aristotle if one pushed hard enough did they really believe orcs, elves, sprites really existed, they'd probably laugh and say, "No", but considering the context and severe limitations of what the classical antiquity scientific community knew 2,000 years ago someone like Ptolemy of Alexandria couldn't outright say or claim they didn't because they did know their was a much larger, bigger world that remained undiscovered and unexplored, so " Who Knows? It just might be real". Again, if someone like Plato or Aristotle or some other ancient naturalist found the mostly intact bones of a long-dead T-Rex or Steggosairus, what's his most logical, realistic reaction going to be?
A large, fire-breathing dragon does seem a bit supernatural to us in the prose and context that it can destroy entire armies, burn cities, towns, villages, leave carnage, destruction for seemingly miles on end is kind of a metaphor in GOT for nuclear weapons. Dragons are a killable version of nuclear weapons in Game of Thrones' Westerosi world mythology. Its not so much their existence that seems strange or odd to us as viewers, or even some Westerosi person, its what they symbolize as weapons and once they died off after this Targaryen Civil War, it took about 100 years or so, but having lost that major tactical advantage, their family's control over the Seven Kingdoms was doomed to end because other competing, major powerful Westeros houses stopped fearing them.
FWIW, there's another GOT prequel coming out, IIRC, next year maybe about Ser Duncan the Tall and his squire, the Egg (future Aegon Targaryen V) and it takes place about 80-90 years before events of GOT, but one of the main themes of that series according to its producers is how many people in Westeros, noble and commoners, have come to believe that dragons never existed or just mere ancient folk tales and how much Targaryen grip on power had weakened or loosened without fear of their dragons to enforce their whims.