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There are few surviving paternal lineages of Cro-Magnons in modern Italy.
As Metternich said in 1847 "Italy is only a geographical expression".
In all likelihood, the territory of the nomadic I2a1 people must have included Northeast Italy and the Dinaric Alps within the refugium.
The tribe grew and split, with some branches going west to Italy and the Western Mediterranean, and the other going east to the Balkans and the Pontic Steppe.
The geographic isolation of Sardinia has left its inhabitants to a large degree unaffected by outside influences, apart from a minority of Phoenician, Roman and Vandal colonisers.
For example, the combined 3% of hapogroups I1, I2a2a and R1a could be attributed to the Vandals, a Germanic tribe who ruled over Sardinia from 435 to 534.