This mosaic is a reproduction of the original Good Shepherd mosaic in the Chapel of Galla Placidia at Ravenna executed in the 5th century. The reproduction is made in the 19th century by Salviati and Co. of Venice and Signor Rosario Riolo, who is known as the restorer of mosaics of the Norman period in Sicily.
The original can be found in a lunette over the entrance of the nave of the sepulchral chapel of the empress Galla Placidia (called now the Church of SS. Nazaro e Celso). The mosaic is now installed in Room 46B at the Victoria and Albert Museum.
Salviati (1816 - ca. 1890) was a lawyer from Vicenza, who became an entrepreneur in glass manufacture, opening his first glass factory and shop in Venice in 1859. In the early years he concentrated mainly on mosaic and glass tiles and in 1866 founded the Venice & Murano Glass & Mosaic Co Ltd. (as Salviati & C) with English capital and the backing of the archaeologist Austen Henry Layard and the antiquarian Sir William Drake.