Not far from the village of Mesa Gonia, in the foothills of Prophet Elias, is the Byzantine church of the Episcopate of Thera, founded at the end of the 11th century by the Emperor Alexios I Comnenos.

It is an inscribed-cross, four-columned church with dome. Preserved in the interior are wall paintings of excellent quality and a wooden, carved templon (iconostasis), decorated in the technique of mastic wax.

This was the seat of the Orthodox and, later, the Latin Episcopate. During the Turkish occupation there were disputes between the Orthodox and Latin inhabitants of the island as to who should hold the property and oversee the running of the church. Today the church gathers large crowds on August Fifteenth, the day of its festival.