stylistic:style_transfer, information:classification, linguistic:translation
Byzantine, Latin, and Ottoman Period

During the Byzantine period, the Parthenon was used as a church dedicated to the Virgin Mary. During the Latin Duchy of Athens, the Acropolis functioned as the city's administrative center, with the Parthenon as its cathedral, and the Propylaea as part of the ducal palace. A large tower was added, the Frankopyrgos (Frankish Tower), demolished during the 19th century.

After the Ottoman conquest of Greece, the Propylaea were used as the garrison headquarters of the Turkish army, the Parthenon was converted into a mosque and the Erechtheum 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 and damaged severely.

During subsequent years, the Acropolis was a site of bustling human activity with many Byzantine, Frankish, and Ottoman structures. The dominant feature during the Ottoman period was a mosque inside the Parthenon, complete with a minaret.

The Acropolis was besieged thrice during the Greek War of Independence —two sieges from the Greeks in 1821–1822 and one from the Ottomans in 1826–1827. A new bulwark named after Odysseas Androutsos was built by the Greeks between 1822 and 1825 to protect the recently rediscovered Klepsydra spring, which became the sole fresh water supply of the fortress.