The city was the political center of the Chaonians, one of the three major Greek tribes in ancient Epirus. From the second half of the 5th century BC, an acropolis was erected, which hosted a number of public buildings, while at the end of the next century the fortifications of the city were expanded as part of Pyrrhus's, leader of united Epirus, defensive strategy. The patron god of the city was probably Athena Polias. The walls of Phoenice consisted of massive blocks up to 3.60 meters thick, the Chaonians' primary concern being to defend the city against Corcyraeans or Illyrian raiders. In circa 233 BC, Queen Deidamia II, the last member of the Aeacid ruling dynasty, was assassinated, the monarchy was abolished in Epirus, and the city became the center of the federal government of the Epirote League.