Most Italians are descended from Germans who conquered Rome, and Normans who took over southern Italy from the Arabs.
same thing with the alsace-lorraine parts of germany and france. lots of mixing of heritages there too.
Well, the Peninsula is divided generally between north and south between Celts/ Germans and Mediterranean peoples, but though the Muslims did take Sicily, and Arabic became the language, not many racial Arabs came, about the same percent as Normans did later on.