The Acropolis platform was enclosed by a wall that was built by the Pelasgians, replacing an older wall. Inside, evidence has been found of a palace dating back to Mycenaean times. Most of the architectural buildings that make up the Acropolis were erected during the period of Pericles (499-429 BC), after the Persian troops of Xerxes I destroyed the previous buildings. The ancient temple of Athena, which housed a statue of Athena Polias, was replaced by the Erechtheion. The Parthenon was built on the foundations of an earlier temple known as Hecatompedon or Preparthenon. Other religious and civil buildings were scattered all over the hill and were well preserved until the 17th century. However, during the period of Ottoman domination, the Parthenon was converted into a mosque, the Erechtheion into a harem and the Propylaea into a gunpowder depot. During the siege of Athens in 1687, the Venetians, led by General Francesco Morosini, caused severe damage with their bombardments. A mortar shell seriously damaged the Parthenon, as it was also being used as a gunpowder store by the Muslims, and it was at that time that the roof of the temple partly collapsed.