Introduction and acknowledgments; I. The area before Claudius; I.1. Historical and topographical summary; I.2.Archeological summary; II.Aquas Claudiam...item Anienem Novam : The Claudian Project; II.1. Historical Summary; II.2. The Monument; II.3. The area at the time of Claudius; III. From Claudius to Aurelian; III.1 Aqueducts; III.2. Horti; III.3. Tombs; IV. The Aurelianic Walls, 271-403 ad; IV.1. Aurelian; IV.2. Maxentius; IV.3. Honorius and Arcadius ; IV.4. The area in Late Antiquity; V. The Middle Ages, 500-1500 ad; V.1. The early middle ages; V.2. The settlement of Porta Maggiore in the Subiaco Register; V.3. The late middle ages and Nicholas V; VI. 16^th to 18^th centuries; VI.1 Antiquarian and Architectural Study; VI.2. Sixtus V and the Acqua Felice; VI.3. The area in the 16^th to 18^th centuries; VII. Gregory xvi and the disencumbrance of Porta Maggiore; VIII. 20^th century; VIII.1. First phase, 1908-38; VIII.2. Second phase, 1950-59; VIII.3. The area in the 20^th century; Monument and Landscape; bibliography; Appendix; plates. Survey drawings by Nicola Macchia, Luca Cevenini, Marco Campolucci and Simone Quilici.

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