[a3n]

> I doubt, that there ever was such a man.

I've heard this question before. I think it's more useful to think of it as "When was the last era when it was possible for one person to know everything that's known?"

Doubtful that there ever was such a particular person, at least because of geography, as you point out, and different concerns in different parts of the world. But there must have been such an era; I don't know when that was.