As it happened in many other parts of Greece, over or adjacent to the ancient temples, often with their materials, the first early-Christian churches and monasteries of Nisyros were built. Most of them have the type of the three-aisled Hellenistic basilica with two columns, mosaic floors, a semicircular apse and marble or stone iconostasis. The 9 early-Christian churches and the monasteries of the Byzantine period are within the settlements or scattered around the island. – The Monastery of Stavros on the hill of the western part of the valley of Lakki. It is celebrated on September 14. – The Monastery of Panagia Kyra (Virgin Mary, our Lady) celebrated on August 23. – The Monastery of Agios Ioannis the Theologian in Nikia. It is celebrated on September 26. – The Monastery of Evaggelistria, 4 km from Mandraki. It is celebrated on the Tuesday after Easter.