This is the sarcophagus of Marcus Claudianus, dating from around 335 CE, very shortly after the Christianization of the Roman Empire by Constantine. It’s iconography is difficult for us to decipher today because it differs so much from how we usually see events in Christian art depicted. For example, just to the left of center you see a figure pointing a stick at some pots on the ground. That’s the Miracle at Cana, Christ’s turning water into wine. To the right of that you see Christ again, here pointing to baskets; the Miracle of the Loaves and Fishes. Moses appears at the far left, striking the rock with his staff and making the fountain of water come. On the far right is the Raising of Lazarus. On the lid, on the left, you might recognize the Nativity of Christ, with the Annunciation to the Shepherds to the right of that. It very strongly resembles a sarcophagus in Syracusa, Sicily, which has very similar depictions.