On the way to Pera Meria, you will see over the hill the byzantine Monastery of Episkopi, one of the oldest monasteries in Kea. There are still remains of the fortified wall that protected the monastery. Probably Episkopi and the broader area of Messaria were the byzantine centers of the island.
Inside the temple there has been discovered a very significant inscription from 4th century A.C. with a list featuring the names of the inhabitants of Ioulis and Korissia. In many spots of the church you can detect ancient building material, such the Doric capital that is embedded in the altar. According to these hints, there should have preexisted in the area of the hill an ancient temple dedicated to goddess Artemis. It celebrates each year on August 15th.