Hellenization or Hellenisation is the historical spread of ancient Greek culture and, to a lesser extent, language, over foreign peoples conquered by Greeks or brought into their sphere of influence, particularly during the Hellenistic period following the campaigns of Alexander the Great in the fourth century BC. The result of Hellenization was that elements of Greek origin combined in various forms and degrees with local elements; these Greek influences spread from the Mediterranean basin as far east as modern-day Pakistan. In modern times, Hellenization has been associated with the adoption of modern Greek culture and the ethnic and cultural homogenization of Greece.
The concept applies to a number of other ancient historical contexts, starting with the Hellenization of the earliest inhabitants of Greece such as the Pelasgians, the Leleges, the Lemnians, the Eteocypriots in Cyprus, Eteocretans and Minoans in Crete (prior to Classical antiquity), as well as the Sicels, Elymians, Sicani in Sicily and the Oenotrians, Brutii, Lucani, Messapii and many others in territories constituting Magna Graecia in modern Italy.