The Acropolis of Athens is an ancient citadel located on an extremely rocky outcrop above the city of Athens and contains the remains of several ancient buildings of great architectural and historic significance, the most famous being the Parthenon. The word acropolis comes from the Greek words ἄκρον (akron, “highest point, extremity”) and πόλις (polis, “city”). Although there are many other acropoleis in Greece, the significance of the Acropolis of Athens is such that it is commonly known as “The Acropolis” without qualification.
While there is evidence that the hill was inhabited as far back as the fourth millennium BC, it was Pericles (c. 495 – 429 BC) in the fifth century BC who coordinated the construction of the site’s most important buildings including the Parthenon, the Propylaia, the Erechtheion and the Temple of Athena Nike. The Parthenon and the other buildings were seriously damaged during the 1687 siege by the Venetians in the Morean War when gunpowder being stored in the Parthenon was hit by a cannonball and exploded.
A temple to Athena Polias, the tutelary deity of the city, was erected around 570–550 BC. This Doric limestone building, from which many relics survive, is referred to as the Hekatompedon (Greek for “hundred–footed”), Ur-Parthenon (German for “original Parthenon” or “primitive Parthenon”), H–Architecture or Bluebeard temple, after the pedimental three-bodied man-serpent sculpture, whose beards were painted dark blue. Whether this temple replaced an older one, or just a sacred precinct or altar, is not known. Probably, the Hekatompedon was built where the Parthenon now stands.
Between 529–520 BC yet another temple was built by the Peisistratids, the Old Temple of Athena, usually referred to as the Arkhaios Neōs (ἀρχαῖος νεώς, “ancient temple”). This temple of Athena Polias was built upon the Doerpfeld foundations, between the Erechtheion and the still-standing Parthenon. Arkhaios Neōs was destroyed by the Persian invasion in 480 BC, however, the temple probably was reconstructed since in 454 BC the treasury of the Delian League was transferred in its opisthodomos. The temple may have been burnt down in 406/405 BC as Xenophon mentions that the old temple of Athena was set on fire. Pausanias does not mention it in his 2nd century AD Description of Greece.
Around 500 BC the Ur-Parthenon was dismantled to make place for a newer and grander building, the “Older Parthenon” (often called Pre-Parthenon, “early Parthenon”). Athenians decided to stop the construction of the Olympieion which was related with the tyrant Peisistratos and his sons and instead used the Piraeus limestone destined for the Olympieion to build the Older Parthenon. To accommodate it, the south part of the summit was cleared, made level by adding some 8,000 two-ton blocks of limestone, a foundation 11 m (36 ft) deep at some points, and the rest filled with earth kept in place by the retaining wall. However, after the victorious Battle of Marathon in 490 BC, the plan was revised and marble was used instead. The limestone phase of the building is referred to as Pre-Parthenon I, the marble phase as Pre-Parthenon II. In 485 BC, construction stalled to save resources as Xerxes took the throne. The Older Parthenon was still under construction when the Persians sacked the city in 480 BC. The building was burned and looted, along with the Ancient Temple and practically everything else on the rock. After the Persian crisis had subsided, the Athenians incorporated many of the unfinished temple’s architectural members (unfluted column drums, triglyphs, metopes, etc.) into the newly built northern curtain wall of the Acropolis, where they serve as a prominent “war memorial” and can still be seen today. The devastated site was cleared of debris. Statuary, cult objects, religious offerings and unsalvageable architectural members were buried ceremoniously in several deeply dug pits on the hill, serving conveniently as a fill for the artificial plateau created around the classic Parthenon. This “Persian debris” is the richest archaeological deposit excavated on the Acropolis and is well known throughout Greece.