A church and a Benedictine monastery existed at the site date prior to the 6th century.
Pope Gregory the Great is said to have patronized its establishment. The seventh-century
Pope Agatho took orders at this monastery. It is said that the Saracen conquerors closed or razed the monastery, perhaps converting the church to a mosque. After the
Norman conquest, circa 1136, the site was restored by
Roger II of Sicily to
Benedictine monks of Saint William of Vercelli . The church was dedicated to St
John the Evangelist. It is not clear why the church gained the tag of
Eremiti. While it is possible that it refers to the cloistered Benedictine monks (hermits, from
Greek eremìtes, monks). In the 19th century, under the guidance of
Giuseppe Patricolo, director of the Royal office for the conservation of monuments of Sicily, the structures were restored aiming for his perspective of their original medieval appearance. ==Architecture==