THE PORTA CAPENA.
For a long number of years the present Porta S. Sebastiano (Porta Appia) was considered to be the Porta Capena. This error was rectified after the stone which marked the first mile was found (1584) in the Vigna Naro outside the present gate. From it one mile (one thousand paces) was measured backwards, and the result was the discovery of the exact site of the Porta Capena by Mr. J. H. Parker in 1868; but the excavations have been filled in. The remains consist of the sill of the gate, with fragments of the jambs, and the pavement of the Via Appia with the raised footpath on each side of it. The west flanking tower of the gate is under the gardener's cottage. This was reopened in 1877. The gate was crossed by the Aqua Appia (Frontinus), which Juvenal mentions as dripping, and Martial as showering down drops.
The Porta Capena is represented twice in the reliefs of Trajan built on to the Arch of Constantine. In the days of Tullus Hostilius, B.C. 668, Horatius killed his sister outside this gate. "A tomb of squared stone was raised for Horatia, on the spot where she fell" (Livy, i. 26).
We now arrive at the river Almo (Marrana), which flows through
THE VALLEY OF THE MUSES,
under the Cœlian Hill, in which is the Fountain of Egeria, whence flowed the perennial fountain by whose waters Numa caught inspiration from the lips of his lovable nymph. Juvenal describes the spot in his description of the parting of Umbricius and himself: "This is the place where Numa consulted his nocturnal friend the nymph: now the grove of the sacred font is occupied by the remains of Jews." "In the valley of Egeria we descended into caves unlike the true." They strolled from the Porta Capena whilst the waggon was loading. At length Umbricius says: "The sun is getting low—I must depart; for long ago the muleteer gave me a hint by cracking his whip."
"Numa was commanded by the nymph Egeria to consecrate that place and the fields about it to the Muses, where he had often entertained a free intercourse and communication with them; and that the fountain which watered that place should be made sacred and hallowed for the use of the vestal virgins, who were to wash and clean the penetralia of their sanctuary with those holy waters" (Plutarch).
Livy (i. 21) thus describes it: "There was a grove, in the midst of which, from a dark cavern, gushed a fountain of flowing water, whither often, because without witness, Numa went to have an interview with the goddess, and which grove he consecrated to the muses, that their councils might be held there with Egeria." The fountain may still be seen under the Cœlian, over the wall on the left;—there is a bath-house of the middle ages built over it. It is in the grounds of the villa of Baron Hoffmann, to whom application must be made to visit it.
Crossing the Marrana, we take the first turning on the right, Via Antonina. This lane leads to the