You do the same with what other people you relate them It was to prove that Dorians who came from the Epir were in reality a Pelasgic group and other Pelasgic group lived in pocket inside Greece so they were not Greek At Homer Herodotus and Thucydides and were said to have inhabited various areas such as Thrace Argos Crete and Chalcidice In the 5th century BC the surviving villages apparently preserved a common non Greek language