Apollo, in Christian art, 25. Appian Way. See _Via Appia_. Aqueduct of Damasus, 121. Aquila and Prisca, 110; their house and oratory, 111, 126. Aræ compitales, 33. See _Altars_. Arch of Claudius, 99; of Constantine, 101; testimony of its inscription to the position of Christianity, 20 (plate); of Marcus Aurelius, panel, 90 (plate). Arco di S. Lazaro, 181. Argeorum sacraria, 33. Artemisium Nemorense, 59. Arx, 85. Athens, Acropolis, probable origin of the gold found here by Herodes Atticus, 289. Atrium sutorium, 275. Atticus, Herodes, bibliography, 288 n.; his father's discovery of riches, 288; his liberality and public spirit, 289; the buildings erected in memory of his wife, 290. Atticus, Pomponius, house of, 191. Atys, 27. Augustea, 173. Augustine, S., his pupil Licentius, 14; on eating and drinking in honor of martyrs, 43; on the celebration of S. Peter's day, 44. Augustus, Emperor, strenæ calendariæ offered to, 34; offerings in the temple of Concord, 54; his house, 71 n.; celebrates the Secular games, 79; dedicates an altar to Peace on the Campus Martius, 82; death and funeral, 168; resolutions in the senate, 169; mausoleum, 172; his _Res gestæ_, 172; his army, 174; his liberalities, 175; public improvements in his time, 176; his mausoleum destroyed, 179; other members of the imperial family buried here, 182. Banqueting-halls, 42. Basilica, origin of its plan in that of the private house, 114 (cut); its form derived from the schola, 118. ---- of Constantine, 162; Julia, 163; of Junius Bassus, 28; of Nereus, Achilleus and Petronilla, 338 (cut). Bassus, Junius, basilica of, 28. Bassus, Pomponius, 192. Baths, in connection with Christian churches, 37; of Diocletian, 38, 48, 74. Bayazid, his gift of the holy lance, 243. Beatrix, martyr, 333; the name corrupted from Viatrix, 334 (cut). Belloni, Paolo, 151. Benedict VII., Pope, tomb, 234. Benedict XII., Pope, 138. Benedict XIV., Pope, 37. Bernini, influence of his school, 250. Bidentalia, 106. Biga, in the Vatican, 27. Bologna, monumental crosses, 35. Boniface I., Pope, 319. Bonifatius, origin of the name, 344. Bosio, Ant., investigator of the Catacombs, 329. Bovillæ, altar to Vedjovis, 68. Bridge of Caligula, 101. Brattius Præsens, 10. Burial, rights of, accorded the Christians, 119; more common than cremation in prehistoric times, 253; early burial in the trunks of trees, 254; clay coffins in the same form, 254; difficulties encountered by the Christians, 308; within the city walls, 325. Burial companies, 258. Byzantine princes, their images in Rome, 162. Cæcilia, S., her tomb discovered by Pope Paschal I., 326. Cæpio, Aulus Crispinius, his tomb, 267. Cæsar, Caius, beloved by Augustus, 184. Cæsar, Julius, his offerings in the temple of Concord, 54. Caffarella, Valle della, 286. Calda, 357. Caligarii, 274.