sentences:  The building, since Stephan Gerlach visited it in the late 15th century, has always been identified with the church of "Hagia Theodosia en tois Dexiokratous".At the beginning of last century, Jules Pargoire identified the building as the church of "Hagia Euphēmia en tō Petriō", built during the reign of Basil I (867–886), and brilliantly explained the change in its dedication.The German archaeologist Hartmut Schäfer, after studies performed in the 1960s on the dating of the basement, estimated the date of construction of the edifice between the end of the eleventh and the first half of 12th century, placing it in the Komnenian period, and identifying it hypothetically as the church of the monastery of "Christos Euergetēs".