Who were the four greatest ancient Greeks?

I’m at Blogographos today.

Imagine maniacal genius has invented a super-laser that he has put into orbit. He is threatening to kill everyone on the planet (and he can) unless four nominations are given to him. If he receives four names from ancient Greece then he’ll carve their faces into the cliffs overlooking Delphi, then destroy his laser and spend the remainder of his days devoting his life to helping orphans. If this ever happens in real-life then the guy is likely to be impatient so it helps to have these things worked out. Which four names do you choose?

You’ll have to visit Blogographis to read my choices.