|The Acropolis of Athens is the best known acropolis in the world. Although there are many other acropolises in Greece, the significance of the Acropolis of Athens is such that it is commonly known as The Acropolis without qualification. The Acropolis was formally proclaimed as the pre-eminent monument on the European Cultural Heritage list of monuments on 26 March 2007. The Acropolis is a flat-topped rock which rises 150 m (490 ft) above sea level in the city of Athens, with a surface area of about 3 hectares. It was also known as Cecropia, after the legendary serpent-man, Kekrops or Cecrops, the first Athenian king. In the Byzantine period, the Parthenon was turned into a church, dedicated to the Virgin Mary. Under the Latin Duchy of Athens, the Acropolis functioned as the city's administrative center, with the Parthenon as its cathedral, and the Propylaia as part of the Ducal Palace. A large tower was added, which was demolished in the 19th century. After the Ottoman conquest, the Parthenon was used as the garrison headquarters of the Turkish army, and the Erechteum was turned into the Governor's private Harem. The buildings of the Acropolis suffered significant damage during the 1687 siege by the Venetians in the Morean War. The Parthenon, which was being used as a gunpowder magazine, was hit by artillery fire and severely damaged.