Ayasuluk Hill was called Apasas or Ancient Ephesus in the Prehistoric and Ionic periods and was the main city unti Croesus, the Lydian King(560BC) moved the city to the area of Artemision. However, the city had to move again when the harbor was silted. When Lysimachus (commander of Alexander the Great) founded the Hellenistic & Roman city of Ephesus the Ayasuluk Hill lost its importance. The digs here, begun in 1990, have proven that there were castles on Ayasuluk Hill going back beyond the original Ephesian settlement to the Neolithic age. The partially restored fortress' remains today date from Byzantine, Seljuk and Ottoman times. Excavations of the Inner Fortress here have also uncovered the remains of three houses in the Kale Mosque, an area comprised of 15 bedrooms now dubbed the Southern Terrace . Since 2010, more than 100m of the western walls and towers have been restored using original materials. The Turks rebuilt and added to the citadel, which has 15 watch towers and contains numerous cisterns, the remains of a Byzantine church and a small mosque.