The evidence can however confirm that as early as the late 10th or early 11th century the monastery existed. It is mentioned in at least three manuscripts. The monastery is referred to in a letter by Saint Paul of Xeropotamou dating from 1016. The will of the monk Demetrius of Chalki, dating from 1030, is signed by a monk who calls himself "Theoktistos monk and abbot of Esphigmenou monastery". Finally, the monastery is mentioned in the second "Typicon" of Mount Athos in 1046.