Ancient times
An acropolis site of the Monte Vico area was inhabited from the Bronze Age, as Mycenaean and Iron Age pottery finds attest. Euboean Greeks from Eretria and Chalcis arrived in the 8th century BC to establish an emporium for trade with the Etruscans of the mainland. This settlement was home not only to Greeks, but a mixed population of Greek, Etruscan and Phoenician inhabitants. Because of its fine harbor and the safety from raids afforded by the sea, the settlement of Pithecusae became successful through trade in iron and with mainland Italy; at its peak, Pithecusae was home to about 10,000 people.
The ceramic Euboean artifact inscribed with a reference to "Nestor's cup" was discovered in a grave on the island in 1953. Engraved upon the cup are a few lines written in the Greek alphabet. Dating from c. 730 BC, it is one of our most important testimonies to the early Greek alphabet, from which our own Latin alphabet descends via the Etruscan alphabet. The inscription also seems to be the oldest written reference to the Iliad.
In 474 BC, Hiero I of Syracuse came to the aid of the Cumaeans, who lived on the mainland opposite Ischia, against the Etruscans and defeated them on the sea. He occupied Ischia and the surrounding Parthenopean islands and left behind a garrison to build a fortress before the city of Ischia itself. This was still extant in the Middle Ages, but the original garrison fled before the eruptions of 470 BC and the island was taken over by Neapolitans. The Romans seized Ischia (and Naples) in 322 BC.
Christian era until the 16th century
In 6 AD, Augustus restored the island to Naples in exchange for Capri. Ischia suffered from the barbarian invasions, being taken first by the Heruli then by the Ostrogoths, being ultimately absorbed into the Eastern Roman Empire. The Byzantines gave the island over to Naples in 588 and by 661 it was being administered by a Count liege to the Duke of Naples
