Marble Stoa and Gymnasium, two "twin" monuments in Hierapolis

The paper focuses on the Marble Stoa and the Gymnasium, two public buildings constructed in Hierapolis in the central decades of the 1st century AD. The buildings are essentially composed of porticoes with a single nave and a Doric-order colonnade, and constitute the exact transposition of the same design, from the point of view of proportions, dimensions and mouldings. The archaeometric examination of the marble façades offers an opportunity for a broader reflection on the planning process, building site procedures and procurement strategies adopted for these "twin" buildings.