The Holy Monastery of Konstamonitou, according to tradition, was built by Constantine the Great, although historical data exists only from the 11th century. The monastery honors the memory of the First-martyr, Saint Stephan.
The Monastery treasures the 12th century icon of the Most Holy Virgin «Odigitria» (Directress), a gift from Anna Philanthropene, the icon of the Most Holy Virgin «Antiphonitria,» and the icon of Saint Stephan, dating from the 8th century.
In the library there are preserved 110 manuscripts dating from between the 12th and 18th centuries.
In the sacristy of the monastery there is treasured a segment of the mantle of our Lord Jesus Christ.