“Eodem tempore fecit Constantinus Augustus basilicam in palatio Sessoriano, ubi etiam de ligno S. crucis D. N. Jesu Christi posuit.” (Anastasius in vita S. Silvestri papæ, xxxiv. § 41.) [30] Frontinus, c. 6. Pyrrhus was king of Epirus, and came to the aid of the Samnites against the Romans; he was conquered _c._ B.C. 272. [31] The passage is corrupt, as will be explained. The following is the reading, as given by Buecheler, whose text is _an exact copy_ of the best manuscript, that of Monte Cassino:—“Anio Vetus citra quartum milliarium _infra Novum_, _qui_ a via Latina in Lavicanam _inter_ arcus trajicit, et ibi piscinam habet. Inde intra secundum milliarium partem dat in specum, qui vocatur Octavianus, et pervenit in regionem _viæ Novæ_ ad hortos Asinianos, unde per illum tractum distribuitur. Rectus vero ductus, _secundum Spem_ (_Specum_) veniens intra portam Exquilinam, in altos rivos per urbem deducitur.” (Frontin., c. 21.) _Infra Novum_, therefore, signifies within the fourth mile on the Via Nova, the New Road of the time of Frontinus, the Via Appia Nova (?). [32] Frontin., c. 18. [33] Signor F. Gori, who is a native of Subiaco, and has followed the line of the aqueducts on foot from Subiaco to Rome, says that he has found the source of the Anio Vetus in the river Anio, at three miles from Subiaco, on the _Via Sublacensis vetus_, twenty miles from the old gate of Tibur or Tivoli, in the district called _Le Connotta_, where he finds two _specus_, the higher one the Anio Novus, the lower one the Anio Vetus. He traces the same _specus_ near Marano, a village thirty-eight miles from Rome, on the Via Sublacensis Neroniana, near _Vico-varo_; and again near Tivoli, on the bank of the _Valle degli Arci_. “Delle vere Sorgenti dell’ Acqua Marcia e delle altre acque allacciate dai Romani presso le Vie Valeria e Sublacense,” per F. Gori. Roma, 1866, 8vo., pp. 53, 54. [34] The local _patois_ for _Albergo_ or _Auberge_. IMP. CAESAR DIVI. F. AVGVST. EX . S.C. dclix. P. CCXL. IMP. CAESAR . DIVI. F. AVGVST. EX . S.C. dclxix. P. CCXL. [35] By the side of a plan of Rome in the first volume of his magnificent work (pl. xxxviii.), Piranesi gives a section of the relative heights of the Aqueducts, as compared with each other. The figures refer to the base of each _specus_ above that of the Appian, and the following is the result, according to his measurements, reduced to English feet:— Above Specus of Appian. Palmi. Feet.