In Roman times, the ancient Greek region of Epirus became the province of Epirus vetus ("Old Epirus"), while a new province Epirus Nova ("Epirus Nova") was formed out of parts of Illyria that had become "partly Hellenic or partly Hellenized". The line of division between Epirus Nova and the province of Illyricum was the Drin River in modern northern Albania. Based on the accounts of Procopius the population of the region as north as Dyrrachium was Greek during the 6th century AD.