The bridge never existed. Caligula made use of the roofs of edifices which were already there, spanning only the gaps of the streets with temporary wooden passages. This is clearly stated by Suetonius in chapters xxii. and xxxvii. and by Flavius Josephus, "Antiq. Jud." xix. 1, 11. From the palace at the northeast corner of the Palatine, he crossed the roof of the _templum divi Augusti_, then the _fastigium basilicæ Juliæ_, and lastly the Temple of Saturn close to the Capitolium. The Street of Victory which divided the emperor's palace from the Temple of Augustus, the Street of the Tuscans which divided the temple from the basilica, and the Vicus Iugarius between the basilica and the Temple of Saturn, were but a few feet wide and could easily be crossed by means of a _passerelle_. We are told by Suetonius and Josephus how Caligula used sometimes to interrupt his aerial promenade midway, and throw handfuls of gold from the roof of the basilica to the crowd assembled below. I have mentioned this bridge because the words of Suetonius, _supra templum divi Augusti ponte transmisso_, gave me the first clew towards the identification of the splendid ruins which tower just behind the church of S. Maria Liberatrice, between it and the rotunda of S. Teodoro. The position of Caligula's palace at the northeast corner of the Palatine being well known, as also the site of the Basilica Julia, it is evident that the building which stands between the two must be the Temple of Augustus. This conclusion is so simple that I wonder that no one had mentioned it before my first announcement in 1881. The last nameless remains adjoining the Forum have thus regained their place and their identity in the topography of this classic quarter. [Illustration: Plan of the Temple of Augustus.] [Illustration: Remains of the Temple of Augustus, from a sketch by Ligorio.]