Logic Puzzle: Socrates and Euclid

I've used this with students in the past to see if they have a grasp of when certain historical events were in relation to each other or who lived first. (I'll admit, I was bad with that sort of thing back then.)

But here's the puzzle: without giving me any dates (so don't bother with wikipeida), just some kind of relationships to people and events, prove to me which of these great thinkers came first: Socrates or Euclid.

Sometimes they can work a simple chain of events that doesn't require footnotes and a bibliography.