Sparta and the Spartan-controlled territories evolve into a feudal society in which the Spartan nobility is the heavily privileged upper-caste. There are tensions between Athens and Sparta, much like a ‘cold war’. 326 BC - 313 BC When the Romans threaten to attack the Greek colony of Neapolis, the Athenians decide to send troops to Italy. Together with the Samnite League, the Greeks succeed in stopping the Roman invasion. The now large Delian League faces internal problems and Athens faces increasing political pressure from the Spartans and the Celts. 1334 AD - 1338 AD