Oil Lamp with Sheep and Staurogram

Circa 420-550
Archeological Museum, Split, Croatia

The staurogram represents the crucified Christ, as explained on this page. The approach of sheep representing the faithful to a symbol of Christ is common in paleo-Christian art.

The label in the museum speaks of two sheep in the image, but I can see only one.

This image in full resolution
More of the sheep/lamb symbol.
More of the staurogram symbol

Source: Photographed at the site by Richard Stracke, shared under Attribution-NonCommercial-ShareAlike license.