Introduction

The following typographical errors have been corrected: Page v, "Romana" changed to "Romano" (by Giulio Romano, Francesco Penni,) Page 59, "Bulletino" changed to "Bullettino" (in footnote : See Henzen, Bullettino dell' Instituto, 1863,) Page 91, "Receuil" changed to "Recueil" (in footnote : Leon Renier: Recueil des diplomes militaires) Page 120, "Ardentina" changed to "Ardeatina" (S. Petronilla on the Via Ardeatina) Page 131, "Venedetto" changed to "Benedetto" (the master-mason Benedetto Drei, whose drawing,) Page 147, "Winckelman" two times changed to "Winckelmann" (Fea and Winckelmann assert and Winckelmann attributes their rapid decay) Page 185, "in" changed to "is" (the urn of Agrippina is kept in the courtyard) Page 208, "Emmanuele" changed to "Emanuele" (southwest corner of the Piazza Vittorio Emanuele) Page 273, "astrinum" changed to "ustrinum" (it was an astrinum where corpses were cremated) Page 314, "Bulletino" changed to "Bullettino" (in footnote : Bullettino di archeologia cristiana) Page 327, "Nicolas" changed to "Nicholas" (from the time of Pope Nicholas I.) Page 369, "Cerceo" changed to "Circeo" (defeats the Saracens off Cape Circeo) Page 373, "Guilio" changed to "Giulio" (di Papa Giulio, 254;)

BATTLE BETWEEN CONSTANTINE AND MAXENTIUS (from a painting by Giulio Romano, Francesco Penni, and Raffaellino del Colle) (Heliotype) Frontispiece

PLAN OF THE GRAVES SURROUNDING THAT OF S. PETER DISCOVERED AT THE TIME OF PAUL V. (from a rare engraving by Benedetto Drei, head master mason to the Pope. The site of the tomb of S. Peter and the Fenestella are indicated by the author) 132

The drawings in this volume, with a few exceptions, are by Harold B. Warren, of Boston, who also made the drawings for "Ancient Rome in the Light of Recent Discoveries."