Detail of the Sarcophagus of Domatilla: Symbolic Representation of the Crucifixion and Resurrection
Museo Pio Christiano, Rome
The placement of the chi-rho symbol atop the cross appears to be a way of referring simultaneously to the Crucifixion and to the Resurrection, which is further suggested by the somnolent soldiers.
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More of the Resurrection
More of the Crucifixion
Photographed at the museum by Richard Stracke, shared under Attribution-NonCommercial-ShareAlike license.