A common misconception that is often debunked is that before Columbus everyone thought the world was flat.

But at this time how many people knew/suspected the earth was spherical?

What about other civilisations such as the Romans, Greek, Egyptians, Babylonians, Europe during the dark ages?

At these times would most people have thought it or only that natural scientists/upper class members of society?

Was there any defining discovery that tipped in favour Globe earth that many people become aware of?

Thanks in advance for your replies.