The Acropolis in Athens has been in use by humans since the Neolithic period.
In the late Helladic age, a Mycenaean settlement built a wall there, later to be
called the Cyclopean wall on account of its large stones. Various Mycenaean
buildings stood atop the Acropolis, including the tomb of Cecrops, supposed
founder of the Athenian dynasty.
During the Archaic period, the Peisistratid Temple of Athena was built
circa 529 BC. Some consider this temple to have been a precursor to the
Parthenon, though the exact details of this building are as yet unknown.
A new phase of building was begun after 490 BC (the battle of Marathon).
The Acropolis' terraces were enlarged and the building of a new temple (now called
the pre-Parthenon) was begun. However, the Persian sack of 479 halted the
construction of this temple permanently.