Christian symbolism - Wikipedia
The image of the Good Shepherd, often with a sheep on his shoulders, is the most common of the symbolic representations of Christ found in the Catacombs of Rome, and it is related to the Parable of the Lost Sheep. Initially it was also understood as a symbol like others used in Early Christian art. By about the 5th century the figure more often took on the appearance of the conventional depiction of Christ, as it had developed by this time, and was given a halo and rich robes.
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