The Via Salaria is said to have been so named from the supplies of salt conveyed along it to the Sabine district at the time when the Romans and Sabines were confederates. It is first mentioned in history as the scene of the single combat between Manlius and the gigantic Gaul. The ancient road passed out at the Collina gate, and followed very nearly the same line as the present road along the left bank of the Tiber, as may be seen by the ruins near Serpentara, and by the position of the ancient bridge, the Ponte Salaro, which carries it over the Anio close to Antemnæ. Beyond this, Fidenæ and the Allia are the most remarkable points of interest upon the road in the neighbourhood of Rome. Beyond Malpasso, the ancient road, according to Nibby, diverges to the right, crossing the railway to Ancona. The Via Flaminia, after passing through the Porta Ratumena at the Tomb of Bibulus, left the Aurelian fortifications at the Porta Flaminia, which stood a little nearer the slope of Monte Pincio than the present Porta del Popolo. It ran to the right of the present street, and then crossed the Tiber at the well-known Milvian bridge, and then diverged to the right along the Tiber valley, while the Via Cassia ascended to the left among the Etruscan hills towards Veii, which lay to the right at the twelfth milestone. The old Flaminian Road lay closer to the river than the modern, which is carried through a cutting in the hills and rejoins it at Tor di Quinto. There are a few rock tombs on the left hand, between the fifth and sixth milestones. One of them has been connected with the poet Ovid by a mistaken inference drawn from the inscription found upon it which bears the name of Q. Nasonius Ambrosius. [Illustration: Ponte Nomentano.] The Ponte Molle, which derives its name from an unknown Roman Mulvius, or from the neighbouring hills, carries the Flaminian Road over the Tiber at a distance of two miles from the Porta del Popolo. Some of the foundations of the bridge, and parts of the peperino and travertine stonework in the smaller arches, are ancient. The victory of Constantine over Maxentius, which is usually called the battle of the Pons Mulvius, was gained six miles further along the road. An inscription cut in a block of travertine has been fixed in the right-hand parapet of the bridge. This inscription records the inspection of the banks of the Tiber by the Censors of M. Valerius and Publius Serveilius, who were Censors in the year B.C. 55. [Sidenote: Villa of Livia at Prima Porta.] One of the imperial villas of an early date was placed on the right bank of the Tiber at the ninth milestone on the Via Flaminia in the Veientine territory.