Entering the century that was the zenith of Ancient Greek society, this period saw a high degree of Greek unity early on. After the Ionian Revolts, most of the Greek city-states were united against Persia when Darius tried to invade, and even more so when his son Xerxes made his own attempt a decade later. It led to unprecedented cooperation between the city-states, particularly the second invasion where Sparta and Athens led a coalition of states against Xerxes. The war led to the establishment of the Delian League led by Athens, which united states against Persia with the promise of revenge. However, it also ensured the s**erpower status of Athens and Sparta, who would be locked in rivalry for decades, eventually spilling over into war. Despite this, the Persian Wars would remain a uniting memory for most Greek states and a point of common pride, where they all stood together to defeat a tyrannical invader. This is reflected in Spartan rhetoric at the outset of the Peloponnesian War, which was meant to compare it to the Persian Wars and stir ** Greeks to join them. Representing a time of uncommonly cooperative relations between states (nothing brings people together like a common threat) and camaraderie, it was appropriate that the Persian Wars were early events in what is considered the Greek Golden Age. This helmet, from around the time the Persian Wars begins, can thus serve as a reminder for the events that led Greek states to better relations than ever before.