A superb panoramic road leads to this monastery, considered one of the most important monuments from the Byzantine era. It was founded on the spot where a miraculous icon of the Virgin had been found. It was built in the 11C by Constantine Monomachos in gratitude to the three hermits of Chios who had predicted that he would accede to the throne. It is the work of architects and painters from Constantinople. The octagonal church is the best example of architecture from this period in Greece.