 Dinsmoor concluded that the latest possible date for Parthenon I was no earlier than 495 BC, contradicting the early date given by Dörpfeld.Further, Dinsmoor denied that there were two proto-Parthenons, and held that the only pre-Periclean temple was what Dörpfeld referred to as Parthenon II.Dinsmoor and Dörpfeld exchanged views in the "American Journal of Archaeology" in 1935.