Okay, first of all, this was hard. And I am impressed to see that so much of what we know of
these ancient Greeks and Romans is due to Plutarch. Some, like Cicero, Cato, Caesar, are
written about by a number of historians. I found two that seem to be know to us only thru'
Plutarch. One is Lycurgus, (of Sparta, not Athens) who seemed to be most influential in shaping
the history of those two countries. And Artaxerxes II, brother of the younger Darius, a most
colorful figure who also is little known outside Plutarch (and the Bible, of course).
So, for those reasons, I'm voting for Artaxerxes II and Lycurgus of Sparta.