Due to its remote, mountainous character, Arcadia seems to have been a cultural refuge. When, during the Greek Dark Age, Doric Greek dialects were introduced to the Peloponnese, the older language apparently survived in Arcadia, and formed part of the Arcado-Cypriot group of Greek languages. Herodotus says that the inhabitants of Arcadia were Pelasgians, the Greek name for the supposed 'indigenous' inhabitants of Greece, who dwelt there before the arrival of the 'Hellenic' tribes.Herodotus I, 56–57 Whilst Herodotus seems to have found the idea that the Pelasgians were not 'Greek' far-fetched, it is clear that the Arcadians were considered as the original inhabitants of the region.Herodotus VIII, 73
