Detail of the Sarcophagus of Domatilla: Symbolic Representation of the Crucifixion and Resurrection

Mid-4th century
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.