Investigations at the site of the Mura di Santo Stefano near Anguillara began as a study of the standing remains of the Roman period by the two authors of the present paper. Subsequently it became clear that some of the problems involved could only be elucidated by the excavation of selected areas of the site and more extensive researches. As a result a more general publication about the site is envisaged and further work is in progress, including a study of the inscriptions by Miss J. M. Reynolds, and of the classical and medieval settlement of the area by Dr. A. T. Luttrell. Excavations on the site conducted by Dr. D. Whitehouse commenced in September 1977, with financial support from the British Academy, the British Museum, the British School at Rome, and the University of Adelaide.
The present authors wish to thank Professor H. Burns, who generously advised on problems connected with the drawings and text of Ligorio and Palladio, and T. F. C. Blagg who produced the drawing of the south wall, and added a number of useful observations.
The British Academy, the British Museum, and the University of Adelaide generously made contributions to the expenses incurred in carrying out these researches.