The Classical Age of Greece produced some of history's best-known generals and commanders. They include the Spartan king Leonidas, who embodied his countrymen's heroic ethos in the battle of Thermopylae; the Athenian leader Themistocles, credited as the architect of Athens' naval power and of the Greek victory over the Persians; the famous democratic leader, Pericles, who prepared Athens and directed its conflict with Sparta, known as the Peloponnesian...