The town of Byllis was founded in the 4th century BCE. Before becoming part of the Roman Empire, Byllis was part of the Macedonian and Illyrian Kingdom and of the Byllian Koinon. In the year 30 BCE Byllis became a Roman colonia and florished until the Attacks of the Visigoth in the late 4th century destroyed the town and it emerged only in the 5th century. In 458 Byllis was a bishop's see and became one of the eight most important cities of Epirus accordikg to Hierokles. The town was destroyed and abandoned after an Slavic attack in 586. Findings of coins of Stefan Uroš IV Dušan allow to assume that soldiers and farmers still have trespassed the towns area. Byllis was home to five basilicas.