Certainly the Thracians and the Illyrians were non-Greek speakers, but in the northwest, the peoples of Molossis (Epirot province), Orestis and Lynke… - Robert Morkot

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Certainly the Thracians and the Illyrians were non-Greek speakers, but in the northwest, the peoples of Molossis (Epirot province), Orestis and Lynkestis spoke West Greek. It is also accepted that the Macedonians spoke a dialect of Greek and although they absorbed other groups into their territory, they were essentially Greeks.