"Post insepulta membra different lupi,
Et Esquilinæ alites."
Hor. Ep. v. 100.

"The Campus Esquilinus, between the roads which issued from the Esquiline and Viminal gates, was the spot assigned for casting out the carcases of slaves, whose foul and half-burnt remains were hardly hidden from the vultures. The accursed field was enclosed, it would appear, neither by wall nor fence, to exclude the wandering steps of man or beast; and from the public walk on the summit of the ridge, it must have been viewed in all its horrors. Here prowled in troops the houseless dogs of the city and the suburbs; here skulked the solitary wolf from the Alban hills, and here perhaps, to the doleful murmurs of the Marsic chaunt, the sorceress compounded her philtres of the ashes of dead men's bones. Mæcenas (B.C. 7) deserved the gratitude of the citizens, when he obtained a grant of this piece of land, and transformed it into a park or garden.... The Campus Esquilinus is now part of the gardens of the Villa Negroni."—Merivale, Romans under the Empire.

Within what were the grounds of the Villa Negroni until they were encroached upon by the railway, but now only to be visited with a "lascia passare" from the station master, are some of the best remains of the Agger of Servius Tullius. In 1869—70, some curious painted chambers were discovered here, but were soon destroyed,—and the foolish jealousy of the authorities prevented any drawings or photographs being taken. The Agger can be traced from the Porta Esquilina (near the Arch of Gallienus), to the Porta Collina (near the Gardens of Sallust). In the time of the empire it had become a kind of promenade, as we learn from Horace.[248]

Opposite the station are the vast, but for the most part uninteresting, remains of the Baths of Diocletian, covering a space of 440,000 square yards. They were begun by Diocletian and Maximian, about A.D. 302, and finished by Constantius and Maximinus. It is stated by Cardinal Baronius, that 40,000 Christians were employed in the work; some bricks marked with crosses have been found in the ruins. At the angles of the principal front were two circular halls, both of which remain; one is near the modern Villa Strozzi, at the back of the Negroni garden, and is now used as a granary, the other is transformed into the Church of S. Bernardo.

The Baths are supposed to have first fallen into decay after the Gothic invasion of A.D. 410. In the sixteenth century the site was sold to Cardinal Bella, ambassador of Francis I. at Rome, who built a fine palace among the ruins; after his death, in 1560, the property was re-sold to S. Carlo Borromeo. He sold it again to his uncle, Pope Pius IV., who founded the monastery of Carthusian monks. These, in 1593, sold part of the ruins to Caterina Sforza, who founded the Cistercian convent of S. Bernardo.

About 1520, a Sicilian priest called Antonio del Duca came to Rome, bringing with him from Palermo pictures of the seven archangels (Michael, Gabriel, Raphael, Uriel, Santhiel, Gendiel, and Borachiel), copied from some which existed in the Church of S. Angiolo. Carried away by the desire of instituting archangel-worship at Rome, he obtained leave to affix these pictures to seven of the columns still standing erect in the Baths of Diocletian, which, ten years after, Julius II. allowed to be consecrated under the title of Sta. Maria degli Angeli; though Pius IV., declaring that angel-worship had never been sanctioned by the Church, except under the three names mentioned in Scripture, ordered the pictures of Del Duca to be taken away.[249] At the same time he engaged Michael Angelo to convert the great oblong hall of the Baths (Calidarium) into a church. The church then arranged was not such as we now see, the present entrance having been then the atrium of the side chapel, and the main entrance at first by what is now the right transept, while the high altar stood in what is now the left transept. In 1749, the desire of erecting a chapel to the Beato Nicolo Albergati, led to the church being altered, under Vanvitelli, as we now see it.

The Church of Sta. Maria degli Angeli, still most magnificent, is now entered by a rotunda (Laconicum) which contains four monuments of some interest; on the right of the entrance is that of the artist Carlo Maratta, who died 1713; on the left that of Salvator Rosa, who died 1673, with an epitaph by his son, describing him as "Pictorum sui temporis nulli secundum, poetarum omnium temporum principibus parem!" Beyond, on the right, is the monument of Cardinal Alciati, professor of law at Milan, who procured his hat through the interest of S. Carlo Borromeo, with the epitaph "Virtute vixit, memoria vivit, gloria vivet,"—on the left, that of Cardinal Parisio di Corenza, inscribed, "Corpus humo tegitur, fama per ora volat, spiritus astra tenet." In the chapel on the right are the angels of Peace and Justice, by Pettrich; in that on the left Christ appearing to the Magdalen, by Arrigo Fiamingo. Against the pier on the right is the grand statue of S. Bruno, by Houdon, of which Clement XIV. (Ganganelli) used to say, "He would speak, if the rule of his Order did not forbid it."

The body of the church is now a perfect gallery of very large pictures, most of which were brought from St. Peter's, where their places have been supplied by mosaic copies. In what is now the right transept, on the right, is the Crucifixion of St. Peter, Ricciolini; the Fall of Simon Magus, a copy of Francesco Vanni (the original in St. Peter's); on the left, St. Jerome, with St. Bruno and St. Francis, Muziano (1528—92) (the landscape by Brill); and the Miracles of St. Peter, Baglioni. This transept ends in the chapel of the Beato Nicolo Albergati, a Carthusian Cardinal, who was sent as legate by Martin V., in 1422, to make a reconciliation between Charles VI. of France and Henry V. of England. The principal miracle ascribed to him, the conversion of bread into coal in order to convince the Emperor of Germany of his divine authority, is represented in the indifferent altar-piece. In the left transept, which ends in the chapel of S. Bruno, are: on the left, St. Basil by the solemnity of the Mass rebuking the Emperor Valens, Subleyras; and the Fall of Simon Magus, Pompeo Battoni;—on the right, the Immaculate Conception, P. Bianchi; and Tabitha raised from the Dead, P. Costanzi.

In the tribune are, on the right, the Presentation of the Virgin in the Temple, Romanelli; and the Martyrdom of St. Sebastian, a grand fresco of Domenichino, painted originally on the walls of St. Peter's, and removed here with great skill by the engineer Zabaglia;—on the left, the Death of Ananias and Sapphira, Pomarancio; and the Baptism of Christ, Maratta.

On the right of the choir is the tomb of Cardinal Antonio Serbelloni; on the left that of Pius IV., Giovanni Angelo Medici (1559-1565), under whose reign the Council of Trent was closed,—uncle of S. Carlo Borromeo, a lively and mundane pope, but the cruel persecutor of the Caraffa nephews of his predecessor, Paul IV., whom he executed in the Castle of S. Angelo.