The Monastery of Saint Sergios of Medikion (Μονή Αγίου Σεργίου του Μηδικίου), commonly simply known as the Medikion monastery (Μονή  Μηδικίου) and later as the Monastery of the Holy Fathers (Μονή των Πατέρων) is a ruined Byzantine-era monastery near modern Trilye in  Turkey (medieval Trigleia in Bithynia). It is best known for the role its founders played in opposing Byzantine iconoclasm.