Twining, Louisa: Symbols and emblems of early and mediaeval Christian art (London: Longman, Brown, Green and Longmans, 1852)

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PLATE LIIL
THE APOSTLES.
The earliest form in which the Apostles were symbolically represented was that of
the Sheep, but it has not been continued in later periods of Art; in the Mosaics of the
early Churches and Basilicas, and on the Sarcophagi of the Catacombs, the Twelve
Sheep are frequently met with, arranged on each side of a central Sheep or Lamb,
which figured the Saviour, and they are generally represented as coming out of the
Gates of the Cities of Jerusalem and Bethlehem.