 This picture was somewhat complicated by the publication of the final report on the 1885–90 excavations, indicating that the substructure was contemporary with the Kimonian walls, and implying a later date for the first temple.If the original Parthenon was indeed destroyed in 480, it invites the question of why the site was left a ruin for thirty-three years.One argument involves the oath sworn by the Greek allies before the Battle of Plataea in 479 BC declaring that the sanctuaries destroyed by the Persians would not be rebuilt, an oath from which the Athenians were only absolved with the Peace of Callias in 450.