"It is evident that such subject cannot have been in the artist's thoughts, as each stately figure advances towards the throne with the same devout aspect and graceful serenity, the same faith and confidence; the sole observable distinctions being that the two with unlit lamps are somewhat more matronly, their costumes simpler, than is the case with the rest; and that instead of being crowned, as are the others, these two wear veils. Explanation of such attributes may be found in the mystic meaning—the light being appropriate to virgin saints, the oil taken to signify benevolence or almsgiving; and we may conclude that those without light represent wives or widows, the others virgin saints, in this group. Two other diminutive figures (the scale indicating humility), who kneel at the feet of Mary, are Innocent II. and Eugenius III., both vested in the pontifical mantle, but bareheaded. Originally the Mother and Child alone had the nimbus around the head, as we see in a water-colour drawing from this original (now in the Barberini Library) dated 1640, made before a renovation by which that halo has been given alike to all the female figures. Another much faded mosaic, the Madonna and Child, under an arched canopy, high up on the campanile, may perhaps be as ancient as those on the façade."—Mediæval Christian Art.
The portico contains two frescoes of the Annunciation, one of them ascribed to Cavallini. Its walls are occupied by early Christian and pagan inscriptions. One, of the time of Trajan, is regarded with peculiar interest: "MARCUS COCCEUS LIB. AUG. AMBROSIUS PRÆPOSITUS, VESTIS ALBÆ, TRIUMPHALIS, FECIT, NICE CONJUGI SUÆ CUM QUA VIXIT ANNOS XXXXV., DIEBUS XI., SINE ULLA QUERELA." Between the doors is preserved a curious relic—the stone said to have been attached to St. Calixtus when he was thrown into the well. The interior is that of a basilica. The nave, paved with opus-alexandrinum, is divided from the aisles by twenty-two ancient granite columns, whose Ionic capitals are in several instances decorated with heads of pagan gods. They support a richly-decorated architrave. The roof, in the centre of which is a picture of the Assumption of the Virgin, is painted by Domenichino. On the right of the entrance is a ciborium by Mino da Fiesole. The high altar covers a confessional, beneath which are the remains of five early popes, removed from the catacombs. Among the tombs are those of the painters, Lanfranco and Ciro Ferri, and of Bastari, librarian of the Vatican, editor of the dictionary of the Della Cruscan Academy, and canon of this church, ob. 1775.
Pope Innocent II. is buried here without a tomb.
In the left transept is a beautiful gothic tabernacle over an altar, erected by Cardinal d'Alençon, nephew of Charles de Valois, and brother of Philippe le Bel. On one side is the tomb of that cardinal (the fresco represents the martyrdom of his patron St. Philip, who is pourtrayed as crucified with his head downwards like St. Peter); on the other is the monument of Cardinal Stefaneschi, by Paolo, one of the first sculptors of the fourteenth century. Opening from hence is a chapel, which has a curious picture of the Council of Trent by Taddeo Zucchero. At the end of the right aisle are several more fine tombs of the sixteenth century, and the chapel of the Madonna di Strada Cupa, designed by Domenichino, from whose hand is the figure of a child scattering flowers, sketched out in one corner of the vaulting.
The upper part of the tribune is adorned with magnificent mosaics, (restored in modern times by Camuccini,) of the time of Innocent II.
"In the centre of the principal group on the vault is the Saviour, seated, with his Mother, crowned and robed like an Eastern Queen, beside him, both sharing the same gorgeous throne and footstool; while a hand extends from a fan-like glory with a jewelled crown held over his head; she (a singular detail here) giving benediction with the usual action; He embracing her with the left arm, and in the right hand holding a tablet that displays the words 'Veni, electa mea, et ponam in thronum meum;' to which corresponds the text, from the song of Solomon, on a tablet in her left hand, 'Læva ejus sub capite meo et dextera illius amplexabitur me.' Below the heavenly throne stand, each with name inscribed in gold letters, Innocent II., holding a model of this church; St. Laurence, in deacon's vestments, with the Gospels and the jewelled cross; the sainted popes, Calixtus I., Cornelius, and Julius I.; St. Peter (in classic white vestments), and Calepodius, a martyr of the third century, here introduced because his body, together with those of the other saints in the same group, was brought from the catacombs to this church.
"As to ecclesiastical costume, this work affords decisive evidence of its ancient splendour and varieties. We do not see the keys in the hands of St. Peter, but the large tonsure on his head; that ecclesiastical badge which he is said to have invented, and which is sometimes the sole peculiarity (besides the ever-recognisable type) given to this Apostle in art.
"Above the archivolt we see a cross between the Alpha and Omega, and the winged emblems of the Evangelists; laterally, Jeremiah and Isaiah, each with a prophetic text on a scroll; along a frieze below, twelve sheep advancing from the holy cities, Jerusalem and Bethlehem, towards the Divine Lamb, who stands on a mount whence issue the four rivers of Paradise—or, according to perhaps juster interpretation, the four streams of gospel truth. Palms and a phœnix are seen beside the two prophets; also a less common symbol—caged birds, that signify the righteous soul incarcerated in the body, or (with highest reference) the Saviour in his assumed humanity; such accessory reminding of the ancient usage, in some countries, of releasing birds at funerals, and of that still kept up amidst the magnificent canonization-rites, of offering various kinds of birds, in cages, at the papal throne.
"Remembering the date of the composition before us, about a century and a half before the time of Cimabue and Giotto, we may hail in it, if not an actual Renaissance, the dawn, at least, that heralds a brighter day for art, compared with the deep gloom previous."—Hemans' Mediæval Christian Art.
Below these are another series of mosaics representing six scenes in the life of the Virgin, the work of Pietro Cavallini, of the thirteenth century, when they were ordered by Bertoldo Stefaneschi, who is himself introduced in one of the subjects. In the centre of the tribune is an ancient marble episcopal throne, raised by a flight of steps.