There have been no shortage of great warrior societies in history, including the Romans, Mongols, Macedonians, and Vikings, the list goes on. Yet one humble city in particular, nestled in a valley near the Eurotas river in the Greek region of the Peloponnese and once ridiculed as little more than a cluster of villages inhabited by uncouth shepherds, produced the most famous warrior elite the world has ever known.

The most unique city-state in Ancient Greece was Sparta, which continues to fascinate contemporaneous society. It is not entirely clear why Sparta placed such a great emphasis on having a militaristic society, but the result was that military fitness was a preoccupation from birth. If a Spartan baby did not appear physically fit at birth, it was left to die. Spartan children underwent military training around the age of 7 years old, and every male had to join the army around the age of 18. Athens might have the mightiest fleet and the greatest cadre of philosophers and dramatists, Thessaly might have had the most vaunted cavalry, and the great city-states of Argos, Thebes and Corinth all had their own claims to fame, but on the battlefield the Spartan phalanx stood without peer.

The Roman army is one of the most famous fighting forces in history. Through its power and prowess, a once obscure Italian city forged an empire that encircled the Mediterranean and covered half of Europe. The physical remains of its presence can be traced from the mountainous borders of Scotland to the arid deserts of Egypt, but its legacy is far greater and more enduring, as Rome's influence continues to shape the political, legal, and cultural landscape of Europe to this very day. While the Roman army is rightly famed as an institution, the image of the individual legionary is also an iconic one. The uniformed, disciplined soldier is one of the first things many people imagine when they think of Rome.