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by Camillo 2800 days ago
> since they include ancient Greek and old-time islamic ancestry (as far as I know)

AFAIK most of the genetic variation in Italy dates back from ancient times. Everyone thinks "of course, it was the Islamic invasions in Sicily and the Germanic invasions in the North", but the genetic impact of those was surprisingly small. The variation was there before.

The Greek colonization of southern Italy is the one historical migration that _did_ have significant impact, according to the article.