The Good Shepherd is a copy of the lunette above the entrance of the Chapel of Galla Placida in Ravenna Italy originally from the 5th century.
The Salviati mosaic lunette on top right in the Weston Cast Court, 2016.
The original mosaic in Ravenna
The museum also bought in 1864 a mosaic medallion of the head of St. John the Evangelist (item 797-1864) from Salviati for 25BP, but it is now also in storage.
The Victoria and Albert Museum
Appell, William. Christian Mosaic Pictures: A Catalogue of Reproductions of Christian Mosaics. London: South Kensington Museum, 1877. 17.
V& A Search.
Inventory of the Objects in the Art Division of the Museum at South Kensington, arranged According to the Dates of their Acquisition. Vol. 1. London : Printed by George E. Eyre and William Spottiswoode for H.M.S.O., 1868.