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Indo-European invasion
The original Italic tribes — who settled Italy in waves between 1800–1000 BC and from whom Italy acquired its namesake — were Central Europeans, descended from the Bell Beaker people (2800–1800 BC). It was these invaders who brought Indo-European language, culture, and religion into the Italian peninsula.
The genetics of Northwestern and Central Europe haven’t changed a great deal since the Beaker period. So, for an idea of what these original Italics looked like, take a look at present-day central Europeans: Swiss, Austrians, Germans, Czechs, etc. It isn’t a direct 1:1 comparison, since phenotypes do change over time (especially in our modern world, filled with estrogenic poisons) but it will give you a general idea of pigmentation, facial structure, hair color, and so on. The early Italics were not exactly ‘Nordic’ as the term is used today (ultra-blond, ultra-pale), but were obviously more Northern than present-day Italians, given that they belonged to the same ancestral population that present-day Northwestern Europeans are directly descended from.