The document discusses early Christian art from the 2nd to 4th centuries AD. It describes how early Christian art was restricted before 313 but grew after Christianity became the official religion. Art was used to transmit faith through symbols like the fish, peacock, and Good Shepherd. The catacombs of Rome contain some of the earliest frescoes depicting biblical stories. After Constantine, churches like basilicas and baptisteries were constructed on a grand scale with rich interior decorations.