Aristotle, Jesus or Muhammad...

One of these people invented empirical science and formal logic and was, for the purposes of his own time, an atheist and materialist (in comparison to just about everyone else). The other two heard voices and started cults.

I suppose this is trivial but lets try to have pride in past rationalists who fought the good fight before it was popular. We need heroes for rationalist children and philosophers and scientists are all we got. (Not uncritical pride mind you, Aristotle was wrong about a great deal).