The production of Roman sarcophagi with carved decoration spread due to the gradual abandonment of the rite of cremation in favour of inhumation over the course of the 2nd century throughout the empire.
In the second half of the 3rd century, especially due to increased demand from this group of wealthy Christians, the use of sarcophagi spread widely, with plastic treatments following trends in contemporary sculpture.
The techniques are the same, but Christian sarcophagi developed a rather different style of layout, with framed scenes, later arranged on two tiers.
The images of Christ move in an iconic direction, very unlike the depiction of gods in pagan equivalents, where deities are normally shown, if at all, in narrative scenes.
A wide variety of subjects are shown on sarcophagi, with the most elaborate containing small cycles of narrative scenes from the gospels and simpler ones symbols such as the Chi Rho.