Part of the palace of the titular cardinal of S. Cesareo remains in the adjoining garden, with an interesting loggia of c. 1200.
In this neighbourhood was the Piscina Publica, which gave a name to the twelfth Region of the city. It was used for learning to swim, but all trace of it had disappeared before the time of Festus, whose date is uncertain, but who lived before the end of the fourth century—
"In thermas fugio: sonas ad aurem,
Piscinam peto: non licet natare."
Martial, iii. Ep. 44.
Here a lane turns on the left, towards the ancient Porta Latina (through which the Via Latina led to Capua), now closed.
In front of the gate is a little chapel, of the sixteenth century, called S. Giovanni in Oleo, decorated with indifferent frescoes, on the spot where St. John is said to have been thrown into a cauldron of boiling oil (under Domitian), from which "he came forth as from a refreshing bath." It is the suffering in the burning oil which gave St. John the palm of a martyr, with which he is often represented in art. The festival of "St. John ante Port. Lat." (May 6) is preserved in the English Church Calendar.
On the left, is the Church of S. Giovanni a Porta Latina, built in 1190 by Celestine III.
In spite of many modernizations, the last by Cardinal Rasponi in 1685, this building retains externally more of its ancient character than most Roman churches, in its fine campanile and the old brick walls of the nave and apse, decorated with terra-cotta friezes. The portico is entered by a narrow arch resting on two granite columns. The entrance-door and the altar have the peculiar mosaic ribbon decoration of the Cosmati, of 1190. The frescoes are all modern; in the tribune, are the deluge and the baptism of Christ,—the type and antitype. Of the ten columns, eight are simple and of granite, two are fluted and of porta-santa, showing that they were not made for the church, but removed from some pagan building—probably from the temple of Ceres and Proserpine. Near the entrance is a very picturesque marble Well, like those so common at Venice and Padua, decorated with an intricate pattern of rich carving.
In the opposite vineyard, behind the chapel of the Oleo, very picturesquely situated under the Aurelian Wall, is the Columbarium of the Freedmen of Octavia. A columbarium was a tomb containing a number of cinerary urns in niches like pigeon-holes, whence the name. Many columbaria were held in common by a great number of persons, and the niches could be obtained by purchase or inheritance; in other cases, the heads of the great houses possessed whole columbaria for their families and their slaves. In the present instance the columbarium is more than usually decorated, and, though much smaller, it is far more worth seeing than the columbaria which it is the custom to visit immediately upon the Appian Way. One of the cippi, above the staircase, is beautifully decorated with shells and mosaic. Below, is a chamber, whose vault is delicately painted with vines and little Bacchi gathering in the vintage. Round the walls are arranged the urns, some of them in the form of temples, and very beautifully designed, others merely pots sunk into the wall, with conical lids, like pipkins let into a kitchen-range. A beautiful vase of lapis-lazuli found here has been transferred to the Vatican.