The name of the fifth century Christian basilica means "made without hands." In the twelfth century people started calling it by this name when an icon of the Virgin appeared miraculously in the church. It has a wooden roof and is one of the first churches with a three-nave basilica, about 28 m wide and 36.5 m long. Its eastern end is a barrel vault, while the west side has a narthex flanked by towers. The three naves are separated by columns, while the two side aisles have galleries above them. At the eastern end of the north aisle is a chapel dedicated to St. Irene. The present entrance is through an arch that connects the lobby to the main hall.