This book presents an in-depth architecture historical and archaeological analysis of the sanctuary site at Pessinus. Dr Angelo Verlinde brings together and scrutinizes all the archaeological data that has been excavated and registered in the period 1967-2008. The discussed topics span a vast period (c. 400 BC - 1000 AD) ranging from the modest early Phrygian dwellings, over the Hellenistic 'citadel' and 'gymnasium', to the Augustan theatre-temple and its Byzantine afterlife. The emphasis lays on Roman imperial architecture in Asia Minor, and especially on the mathematical and stylistic design principles of temples and their Roman influences. The process of reconstruction is elaborated beyond the traditional showcase-element towards the tentative elucidation of ancient design principles in light of 'Vitruvian normality' and analogous architectural data. For this reason, the book includes a detailed catalogue of the architectural elements.