This is considered one of the largest and most beautiful monasteries of Greece. Its founding, according to tradition, dates back to the 10th-11th century. It is also called Kyria ton Angelon (Our Lady of the Angels) and it is the most ancient and unique active monastery of Tinos. It combines the characteristics of island architecture, as well as those of a Venetian fortified settlement. In the monastery there are seven churches, the main church of which is devoted to the Assumption of the Virgin and has a sculpted wood iconostasis and noteworthy mural paintings. By exploring through the narrow alleyways, you will visit the cell of Saint Pelagia, where she saw the vision that led to the discovery of the icon of the Annunciation. The great festival of the monastery takes place on July 23rd.