 Byllis, being a Greek-speaking city, on the borders of Illyria and Epirus, had its own stadium and theatre during the Hellenistic era.Other scholars such as Neritan Ceka argue, based on Pseudo-Scylax and Pliny, that Byllis was Illyrian but there were also Greek speaking collonists in the city.About its foundation it has been suggested that Byllis was founded by Greek settlers, though the fact that it had a mixed population is attested by the Illyrian names of officials.