A tradition universally received in ancient times, and adopted by Virgil, derives the name of Janiculum from Janus, who was the sun-god, as Jana, or Diana, was the moon-goddess. On this hill Janus is believed to have founded a city, which is mentioned by Pliny under the name of Antinopolis. Ovid makes Janus speak for himself as to his property:
"Arx mea collis erat, quem cultrix nomine nostro
Nuncupat hæc ætas, Janiculumque vocat."[378]
Fons, the supposed son of Janus, is known to have had an altar here in very early times.[379] Janus Quirinus was a war-god, "the sun armed with a lance." Thus, in time of peace, the gates of this temple were closed, both because his worship was then unnecessary, and from an idea of preventing war from going forth. It was probably in this character that he was honoured on a site which the Romans looked upon as "the key of Etruria," while other nations naturally regarded it as "the key of Rome."
Janus was represented as having a key in his hand.
"Ille tenens dextra baculum, clavemque sinistra."
"Par un hasard singulier, Janus, qu'on représentait une clef à la main, était le dieu du Janicule, voisin du Vatican, où est le tombeau de Saint Pierre, que l'on représente aussi tenant une clef. Janus, comme Saint Pierre, son futur voisin, était le portier céleste."—Ampère, Hist. Rom. i. 229,
When the first Sabine king of Rome, Numa Pompilius, "like the darlings of the gods in the golden age, fell asleep, full of days,"[380] he was buried upon the sacred hill of his own people, and the books of his sacred laws and ordinances were buried near him in a separate tomb.[381] In the sixth century of the republic, a monument was discovered on the Janiculan, which was believed to be that of Numa, and certain books were dug up near it which were destroyed by the senate in the fear that they might give a too free-thinking explanation of the Roman mythology.[382]
Ancus Martius, the fourth king of Rome, connected the Janiculan with the rest of the city by building the Pons Sublicius, the first bridge over the Tiber; and erected a citadel on the crest of the hill as a bulwark against Etruria, with which he was constantly at war.[383] Some escarpments, supposed to belong to the fortifications of Ancus, have lately been found behind the Fontana Paolina. It was from this same ridge that his Etruscan successor, Tarquinius Priscus, coming from Tarquinii (Corneto), had his first view of the city over which he came to reign, and here the eagle, henceforth to be the emblem of Roman power, replaced upon his head the cap which it had snatched away as he was riding in his chariot. Hence, also, Lars Porsena, king of Etruria, looked upon Rome, when he came to the assistance of Tarquinius Superbus, and retired in fear of his life after he had seen specimens of Roman endurance, in Horatius Cocles, who kept the falling bridge; in Mutius, who burnt his hand in the charcoal; and in the hostage, Cœllia, who swam home across the Tiber,—all anecdotes connected with the Janiculan.
After the time of the kings this hill appears less frequently in history. But it was here that the consul Octavius, the friend of Sylla, was murdered by the partisans of Marius, while seated in his curule chair,—near the foot of the hill Julius Cæsar had his famous gardens, and on its summit the Emperor Galba was buried. The Christian associations of the hill will be noticed at the different points to which they belong.
From the Borgo (Chap. XV.) the unfinished gate called Porta Sto. Spirito, built by Antonio da San Gallo, leads into the Via Lungara, a street three-quarters of a mile long, formed by Sixtus V., and occupying the whole length of the valley between the Tiber and the Janiculan.