This monograph presents a comprehensive analysis of Hadrian's Villa at Tivoli, uniting technical architectural expertise with exhaustive historical and iconographic source material. Grounded in three decades of empirical field research, the work establishes a definitive structural chronology by methodically evaluating brick stamps and factory signatures across individual wall assemblies. This pragmatic, job-site approach reconstructs the sequential ordering and installation of building materials, illuminating Emperor Hadrian's direct role as the primary master planner. Beyond structural logistics, the study systematically examines the functional typology of the complex, re-evaluating subterranean transport networks, domestic and service spaces, and hydraulic gardens. By critically reassessing archival surveys—including the historical documentation of Pirro Ligorio, Francesco Contini, and Francesco Piranesi—the volume moves past isolated structural analyses to deliver an integrated, holistic reading of the site within its broader imperial context.