Scholars believe - though sometimes on the basis of scanty evidence - that the following peoples spoke non-Indo-European languages. Some of them were Pre-Indo-Europeans or Paleo-Europeans while, with regard to some others, Giacomo Devoto proposed the definition of Peri-Indo-European (i.e. everything that has hybrid characters between Indo-European and non-Indo-European).
The specific identities or names of the tribes or groups of peoples that practiced these pre-Roman archeological cultures are mostly unknown. The posited existence of these archeological cultures is based on archeological assemblages of artifacts that share common traits and are found within a certain region and originate within a certain prehistoric period. Therefore, many of these archeological cultures may not necessarily correspond to a specific group of ancient people and, in fact, may have been shared among various groups of ancient peoples. The extent to which an archeological culture is representative of a particular cohesive ancient group of people is open for debate; many of these cultures may be the product of a single ancient Italian tribe or civilization (e.g. Latial culture), while others may have been spread among different groups of ancient Italian peoples and even outside of Italy. For example, Latial culture is believed to be the product specifically of the Ancient Latin tribe; the Canegrate culture and Golasecca culture have been associated with various ancient proto-Celtic, Celtic and Ligure tribes including the Lepontii, Orobii, and Insubres, while other archeological cultures may have been present among multiple groups throughout and beyond the Italian peninsula.
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Herodotus, Histories, ΚΛΕΙΩ 1.56.2: μετὰ δὲ ταῦτα ἐφρόντιζε ἱστορέων τοὺς ἂν Ἑλλήνων δυνατωτάτους ἐόντας προσκτήσαιτο φίλους. ἱστορέων δὲ εὕρισκε Λακεδαιμονίους τε καὶ Ἀθηναίους προέχοντας, τοὺς μὲν τοῦ Δωρικοῦ γένεος, τοὺς δὲ τοῦ Ἰωνικοῦ. ταῦτα γὰρ ἦν τὰ προκεκριμένα, ἐόντα τὸ ἀρχαῖον τὸ μὲν ΠελασγικόνTranslation: Then he set out to examine who among the "Greeks" were the strongest, whom he could make friends with. And searching, he found that the Lacedaemonians and the Athenians were distinguished, the former among the Dorians, the latter among the Ionians. Because these nations were the best known, being in the old days the last Pelasgian [1] /wiki/Herodotus
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