 Its territory is called Bylliake (Βυλλιακή) by Strabo.The walls of Byllis carry more than four inscriptions with details regarding their construction by the engineer Victorinus, as ordered by Emperor Justinian I (483-565).One of the participants in the Council of Ephesus in 431 was a Felix who signed once as Bishop of Apollonia and Byllis, at another time as Bishop of Apollonia.