The Old Temple of Athena or the Archaios Neos was an archaic Greek limestone Doric temple on the Acropolis of Athens probably built in the second half of the sixth-century BCE, and which housed the xoanon of Athena Polias. The existence of an archaic temple to Athena had long been conjectured from literary references until the discovery of substantial building foundations under the raised terrace between the Erechtheion and Parthenon in 1886 confirmed it.