The Older Parthenon or Pre‐Parthenon, as it is frequently referred to, constitutes the first endeavour to build a sanctuary for Athena Parthenos on the site of the present Parthenon on the Acropolis of Athens. It was begun shortly after the battle of Marathon upon a massive limestone foundation that extended and leveled the southern part of the Acropolis summit. This building replaced a hekatompedon and would have stood beside the archaic temple dedicated to Athena Polias.