The great writer Herodotus, well over 2,000 years ago, recounted how the Spartans and Athenians resolved to define who they were and what they were fighting for on the eve of the second Persian invasion in 480 BC. They settled on 3 main points of “Hellenikon” (Greekness):
A. Having the same blood and language
B. Acknowledging the same temples and religion
C. Observing the same customs