Ravenna is the shrine of the craft in the fifth and sixth centuries. It is useless in so small a space to attempt to describe or do justice to these incomparable walls, where gleam the marvellous procession of white robed virgins, and where glitters the royal cortège of Justinian and Theodora. The acme of the art was reached when these mural decorations were planned and executed, and the churches of Ravenna may be considered the central museum of the world for a study of mosaic.
Among those who worked at Ravenna a few names have descended. These craftsmen were, Cuserius, Paulus, Janus, Statius and Stephanus, but their histories are vague. Theodoric also brought some mosaic artists from Rome to work in Ravenna, which fact accounts for a Latin influence discernible in these mosaics, which are in many instances free from Byzantine stiffness. The details of the textiles in the great mosaics of Justinian and Theodora are rarely beautiful. The chlamys with which Justinian is garbed is covered with circular interlaces with birds in them; on the border of the Empress's robe are embroideries of the three Magi presenting their gifts; on one of the robes of the attendants there is a pattern of ducks swimming, while another is ornamented with leaves of a five-pointed form.
There is a mosaic in the Tomb of Galla Placida in Ravenna, representing St. Lawrence, cheerfully approaching his gridiron, with the Cross and an open book encumbering his hands, while in a convenient corner stands a little piece of furniture resembling a meat-safe, containing the Four Gospels. The saint is walking briskly, and is fully draped; the gridiron is of the proportions of a cot bedstead, and has a raging fire beneath it,—a gruesome suggestion of the martyrdom.
No finer examples of the art of the colourist in mosaic can be seen than in the procession of Virgins at San Apollinaire Nuovo in Ravenna. Cool, restrained, and satisfying, the composition has all the elements of chromatic perfection. In the golden background occasional dots of light and dark brown serve to deepen the tone into a slightly bronze colour. The effect is especially scintillating and rich, more like hammered gold than a flat sheet. The colours in the trees are dark and light green, while the Virgins, in brown robes, with white draperies over them, are relieved with little touches of gold. The whole tone being thus green and russet, with purplish lines about the halos, is an unusual colour-scheme, and can hardly carry such conviction in a description as when it is seen.
In the East, the Church of Sta. Sophia at Constantinople exhibited the most magnificent specimens of this work; the building was constructed under Constantine, by the architects Anthemius and Isidore, and the entire interior, walls and dome included, was covered by mosaic pictures.
Among important works of the seventh century is the apse of St. Agnese, in Rome. Honorius decorated the church, about 630, and it is one of the most effective mosaics in Rome. At St. John Lateran, also, Pope John IV. caused a splendid work to be carried out, which has been reported as being as "brilliant as the sacred waters."
In the eighth century a magnificent achievement was accomplished in the monastery of Centula, in Picardie, but all traces of this have been lost, for the convent was burnt in 1131. The eighth was not an active century for the arts, for in 726 Leo's edict was sent forth, prohibiting all forms of image worship, and at a Council at Constantinople in 754 it was decided that all iconographic representation and all use of symbols (except in the Sacrament) were blasphemous. Idolatrous monuments were destroyed, and the iconoclasts continued their devastations until the death of Theophilus in 842. Fortunately this wave of zeal was checked before the destruction of the mosaics in Ravenna and Rome, but very few specimens survived in France.
In the ninth century a great many important monuments were added, and a majority of the mosaics which may still be seen, date from that time: they are not first in quality, however, although they are more numerous. After this, there was a period of inanition, in this art as in all others, while the pseudo-prophets awaited the ending of the world. After the year 1000 had passed, and the astonished people found that they were still alive, and that the world appeared as stable as formerly, interest began to revive, and the new birth of art produced some significant examples in the field of mosaic. There was some activity in Germany, for a time, the versatile Bishop Bernward of Hildesheim adding this craft to his numerous accomplishments, although it is probable that his works resembled the graffiti and inlaid work rather than the mosaics composed of cubes of smalt.
At the Monastery of Monte Cassino in the eleventh century was an interesting personality,—the Abbé Didier, its Superior. About 1066 he brought workers from Constantinople, who decorated the apse and walls of the basilica under his direction. At the same time, he established a school at the monastery, and the young members were instructed in the arts and crafts of mosaic and inlay, and the illumination of books. Greek influence was thus carried into Italy through Monte Cassino.
In the twelfth century the celebrated Suger of St. Denis decorated one of the porches of his church with mosaic, in smalt, marbles, and gold; animal and human forms were introduced in the ornament. But this may not have been work actually executed on the spot, for another narrator tells us that Suger brought home from Italy, on one of his journeys, a mosaic, which was placed over the door at St. Denis; as it is no longer in its position, it is not easy to determine which account is correct.