 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.The city had its own coinage which was different from that of the tribe of the Bylliones.