POROS DURING THE VYZANTINE ERA ...

... Kalavria along with Trizina still existed throughout the early Byzantine years as part of the province of the Byzantine Empire.

But Alaric, leader of the Visigoths, who had settled on the north side of the Balkan peninsula from the beginning of the 3rd century, went across Thessaly and reached central Greece from Thermopylae. The Goths arrived in Attica and Boeotia destroying everything in their way. From the entire destruction, Athens was the only city that pulled through. Corinth, Sparta, Argos and Trizinia got looted by the Goths. They caused such great damage in the region that from the last disastrous invasion, around the last months of 396 A.D., Trizinia and Kalavria ceased to exist.

A few years after the destruction of southern Greece by the Goths of Alaric, a great earthquake literally destroyed what was left of the vicious fury of the Goths. Around that time, Vagionia (a settlement in Kalavria) must have sunk in the sea. The rubble of houses and streets of the city are quite apparent in the shallow waters of the Gulf of Vagionia.

After these regional disasters, while Trizina managed to establish the settlement of Damalasin the succeeding Byzantine years, Poros failed to develop any significant village or residential area. Pirates during the Byzantine years and under Ottoman rule literally plagued the area and used the Vagionian bay which even today is called Barbaria.

At that time, Sfera was uninhabited while Kalavria had a few people who lived in isolated farmhouses and were engaged in the cultivation of a couple of farms and livestock.