Apollonia, Illyria in the context of "Municipium"

The Bylliones (Ancient Greek: Βυλλίονες) were an Illyrian tribe that lived near the Adriatic coast of southern Illyria (modern Albania), on the lower valley of the Vjosa river, in the hinterland of Apollonia. The Bylliones were firstly attested in epigraphic material from the oracle of Dodona dating back to the 4th century BC, and their koinon was firstly attested in a 3rd-century BC inscription from the same oracle. Their territory was trapezoidal on the right side of the rivers Luftinje and Vjosa, extending in the west to the Mallakastra mountains. The chief city of their koinon was Byllis. Another important centre of their koinon was Klos, an earlier Illyrian settlement later called Nikaia, as an inscription attests. The Bylliones also inhabited in the area of an ancient sanctuary of the eternal fire called Nymphaion.

Through contact with their Greek neighbours, in Hellenistic times the Bylliones acquired a certain degree of Hellenization and bilingualism, especially in the urban centres of their koinon. In Hellenistic times their koinon minted coins as attested by inscriptions reporting their ethnicon in Greek letters. The koinon of the Bylliones survived until Roman Imperial times. In the Roman era, the Bylliones reappear in the late 1st century CE when they are mentioned by Pliny the Elder in the Natural History (c. 79 CE) as one of the "barbarian" tribes which lived in the area of Nymphaeum. The koinon of the Bylliones and the koinon of the Amantes were the most notable Illyrian koina.

The Amantes (alternatively attested in primary sources, as Amantieis or Amantini; Ancient Greek: Ἄμαντες or Αμαντιεῖς; Latin: Amantinii) were an ancient tribe located in the inland area of the Bay of Vlora north of the Ceraunian Mountains and south of Apollonia, in southern Illyria near the boundary with Epirus, nowadays modern Albania. A site of their location has been identified with the archaeological settlement of Amantia, placed above the river Vjosë/Aoos. Amantia is considered to have been their main settlement. The Amantes also inhabited in the area of an ancient sanctuary of the eternal fire called Nymphaion.

The Amantes firstly appear in ancient literature in the 4th century BCE in the Periplus of Pseudo-Skylax as an Illyrian tribe bordering the Epirote Chaonians. In Hellenistic sources they are mentioned among the Epirotes. In Roman-times literature they appear as barbarians. In modern historiography a number of scholars regard the Amantes as Illyrians, and others consider them as Epirotes.

Fier (pronounced [fiˈɛɾ]; Albanian definite form: Fieri, Latin: Fierum) is the seventh most populous city of the Republic of Albania and seat of Fier County and Fier Municipality. It is situated on the bank of Gjanica River in the Myzeqe Plain between the Seman in the north, the Vjosë in the south and the foothills of the Mallakastra Mountains in the southeast. Fier experiences a seasonal Mediterranean climate affected by its proximity to the Adriatic Sea in the west.

Fier was founded in the 19th century by the Vrioni family and officially in 1864 by Omer Pasha Vrioni II, the father of Kahreman Pasha Vrioni (1889-1955). It is 7 km (4 mi) from the ruins of the ancient settlement of Apollonia which was founded in 588 BCE by Ancient Greek colonists from Corfu and Corinth, on a site occupied by Illyrian tribes.