The Italoi

The Greeks have had a long history in Italy. With a POD after the rise of Republican Rome, is it possible for the majority/entirety of the Italian Peninsula and Sicily to be mostly Greek in language and population?
 
The Greeks have had a long history in Italy. With a POD after the rise of Republican Rome, is it possible for the majority/entirety of the Italian Peninsula and Sicily to be mostly Greek in language and population?

Of course it's possible. Southern Italy and Sicily remained primarily Greek speaking right up until the Norman invasions though the East Roman Empire did encourage Greeks from Anatolia and the Balkans to settle depopulated areas in the Italian peninsula perodically after a major war.
 
Alexander (or a similar king of the uber-macedonian empire). Or Phyrrus. Or maybe something with the Cimbri/Teutones sacking Rome and its surroundings followed by a sustained hellenistic conquest. Or maybe some giant plague of death. Or maybe some creative POD set in Late Antiquity with the collapse of the empire.
 
Alliance of Greeks and Etruscans (with succequant assimilation) to smash budding Rome and defend themselves against Carthage?
 
I was thinking something around the end of the Classical era, maybe involving the Plague of Justinian. Perhaps Italy is hit harder than OTL, the Greek areas less so than OTL, and Italy is heavily repopulated by Greeks. Would that be plausible?
 
In my TL, Rome is destroyed by the Senones in 387 bc.

Now, the Greeks already had populated almost the entire coastline of Sicily (with the exception of the Carthaginian outposts in the western corner), and almost all of the coastline of southern Italy from Naples (Neapolis) to Spica.

Magna Graecia was heavily populated by Greeks for a very long time (as Ding Said mentioned, until the Norman invasions), so one could presume with the early demise of Rome, the Greeks would continue to live there as a majority ethnic group in southern italy and sicily.
 
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