History: The ancient city of Koroni, or then called Korone, was probably founded in 369 BC in connection with the liberation of Messinia from Sparta. It was located near the present-day town of Petalidi. There are still remains of walls from Roman times and the old harbor pier under water. The Roman travel writer Pausanias reports from ancient Korone. The city, which was a bishop's seat from the 4th century, was abandoned in the 9th century and moved to its current location, where the ancient city of Asine already stood. The remains of an Apollo temple from this time still exist, which was converted into a Byzantine basilica and in whose place the church of Agia Sophia now stands.
In the 6th to 7th centuries, a castle was built on the ruins of the city, which has been used without interruption to this day. The castle stretches over the strategically advantageous headland at the entrance to the Gulf of Messenia and was naturally protected on three sides by its steep cliffs sloping into the sea.Agia Sofia
In the 11th century, the port town of Koroni, together with Methoni, played a key role in the history of trade and Venetian-Byzantine relations.
Koroni was conquered in 1200 by the Genoese pirate Leo Vetrano (d. 1206), fell into the hands of the participant in the Fourth Crusade, William I of Champlitte, in 1205 and was ceded to the Venetians by Godfrey of Villehardouin in 1206.