“there is even a famous painting from the Middle Ages which features a saucer in the sky.”
Actually several, And many many ancient depictions from all over the world. From cultures that had no clue each other even existed. Yet... same images, stories, and similarities.
These have been around since before the beginning of man. :)
Changed my mind - it was the US Navy going back in time with their super technology that started this whole thing - Yeah that’s the same navy that has its most advanced ships collide with container ships ... twice. Well according to some here anyway its the Navy’s doing.