The building of the new Erechtheum was not commenced till the Parthenon and Propylea were finished, and probably not before the year preceding the breaking out of the Peloponnesian war. Its progress was no doubt delayed by that event, and it was probably not completed before 393 B.C. When finished it presented one of the finest models of the Ionic order, as the Parthenon was of the Doric. It stood to the north of the Acropolis. - Smith, 1882