This volume presents the results of the Marmora Phrygiae Project, financed by the Italian Ministry of Education, University and Research (MIUR – Ministero dell’Istruzione, dell’Università e della Ricerca) as part of the “Futuro in Ricerca” programme (FIRB 2012). In the period 2013-2016, following a multidisciplinary approach, the project sought to reconstruct the building stone procurement strategies adopted in the city of Hierapolis in Phrygia (Turkey), across a broad chronological time span from the Hellenistic epoch to the Byzantine period. Extensive knowledge of the territory surrounding the city and detailed research into its monuments provided the basis for a painstaking historical reconstruction. The volume describes the economic, social, technological and legal aspects of the use of marble and presents the results of the archaeometric investigations that were conducted in order to characterise the building stones, determine their provenance and assess the state of conservation of the monuments. In addition, the volume illustrates recent research conducted by teams of various nationalities into the marble quarrying districts and monumental complexes of the main settlements of south-western Asia Minor in the Imperial and Byzantine epochs.