The Temple of Athena Polias at Priene was designed and begun by Pytheos in an epoch of classical revival under the Hekatomnid´s rule in Karia (392 – 334 B. C.). The present Volume III of the Priene series gives, after earlier studies by the Society of Dilettanti and Th. Wiegand, an exhaustive description and analysis as a result of thorough studies of the ruin and all available parts. Its ground plan, a grid of squares and most of the details was obviously ruled by the general axial spacing of the columns (353.3 cm = 12 attic feet) as basic measurement. The temples place in the history of ancient and post-medieval classical architecture and research is demonstrated.