The Parthenon itself replaced an older temple of Athena, which historians call the Pre-Parthenon or Older Parthenon, that was destroyed in the Persian invasion of 480 BC. Like most Greek temples, the Parthenon was used as a treasury. For a time, it served as the treasury of the Delian League, which later became the Athenian Empire. In the 5th century AD, the Parthenon was converted into a Christian church dedicated to the Virgin Mary. After the Ottoman Turk conquest, it was turned into a mosque in the early 1460s, and it had a minaret built in it. On 26 September 1687, an Ottoman Turk ammunition dump inside the building was ignited by Venetian bombardment. The resulting explosion severely damaged the Parthenon and its sculptures. In 1806, Thomas Bruce, 7th Earl of Elgin removed some of the surviving sculptures, with the Ottoman Turks' permission. These sculptures, now known as the Elgin Marbles or the Parthenon Marbles, were sold in 1816 to the British Museum in London, where they are.