It was probably built by the Navigajiosians, who governed the island from 1207 till 1276. Nowadays only some parts of its defensive walls can be detected on Kotsinas Hill dominated by the church of Zoodochou Pigis. Going down its 64 steps you will find the holy water that gushes from an underground spring and the statue of Maroula, who, as it is said, succeeded in beating off the Turks in 1478.