The Monastery Filerimos is located on a hill above Lalyssos, about 10 km from Rhodes Town, close to the village of Trianta. The village stands on the site of the ancient city of Ialysos. Between Trianta and Filerimos, where archeologist found the necropolis of ancient Ialyssos.
A lot of ancient ruins are on the hilltop. The monastery was built in the 5th century AD by the Byzantines, near it there are the ruins of the ancient Ialyssos
The monastery is dedicated to Virgin Mary the Life-Giving Source and its architecture is very different to the usual monasteries in Greece. It was constructed of stone in a Gothic style, on the site of an older Byzantine monastery.
The monastery was built in the 15th century by the Knights of Saint John, who inhabited the island at that time. Inside there was the holy icon of the Virgin Mary that the Knights had brought to Rhodes from Jerusalem. When the Ottomans conquered the island in 1523, the Knights left and took the icon with them.