The death of paganism: how the Roman Empire converted to Christianity

In the year 300 AD, Christianity was a minority religion in the Roman Empire, practiced by perhaps ten percent of the population. In good years it was discriminated against; in bad years it was persecuted. By 400 AD, a century later, it had become the official religion practiced by pretty much everyone. Evidence of this remarkable transformation can still be seen in Rome’s monuments.

Teachers in Sunday schools like to tell a story about how it happened.

In the year 312 there ruled a Roman Emperor named Maxentius who had taken power illegally. He hated Christians and persecuted them. The proper heir to the throne, Constantine, marched on Rome to save the Empire. Before the two forces met in battle, Constantine saw a vision of a cross in the sky and the words “Conquer under this”. Constantine and his army converted to Christianity and painted the cross on their shields. The next day they defeated the pagans and brought Christianity to Rome.

This story is almost entirely wrong, yet it has resonated down the centuries through books, paintings, and films to become part of the Christian legend.

The truth is more complex. Maxentius and Constantine were both sons of emperors and thus equally legitimate. Maxentius did not persecute Christians, and the story of Constantine seeing a cross in the sky doesn’t appear in the texts until years after the battle. Constantine did defeat Maxentius and marched into Rome in triumph, bearing his rival’s severed head as a trophy. After the usual celebrations and gladiator spectacles, he built the Arch of Constantine, which has no Christian symbolism but does depict sacrifices to four pagan gods. In later years he built a number of grandiose churches, including the original St. Peter’s, but didn’t get baptized until his deathbed. Paganism remained legal throughout his reign.

Constantine gave one great boon to the Christians–he legalized their religion. From then on it rapidly gained more followers and began edging out the pagan cults. Soon it was the pagans being persecuted. Rioting monks trashed temples and killed pagan philosophers like Hypatia. In 382 the Altar of Victory was removed from its centuries-old home in the Senate. In 391 paganism was outlawed and temples shut all over the Empire. The old cults hung on for a few generations in rural areas, but Christianity was now the dominant power.

Traces of this incredible transformation are visible in Rome. At the Basilica di San Clemente a 12th century church is built atop a much earlier church. This earlier building was the home of a Roman noble, a secret Christian who invited fellow Christians into his home to worship, a common practice in the days when Christianity was illegal. Underneath his home lies a subterranean temple to the pagan god Mithras.

Entering the medieval church you see the usual grandiose paintings and sculptures. The real interest comes when you descend the stairs into the dank, dark cellar. There you can see the original church much as it was. Descend further and you get back to the days of the pagan Roman Empire. Three rooms survive. One may have been a mint. Another, with a few paintings surviving, was a training room for acolytes in the Mithraic faith. The third is the temple, or mithraeum, for Mithras himself.

%Gallery-102749%Mithras was Christianity’s main rival. As a mystery religion with its deepest teachings revealed only to the initiated, we don’t know much about its inner workings. What we do know shows many similarities between Mithraism and Christianity, such as the belief that Mithras was born on December 25 to a virgin, and died and was resurrected in order to save mankind. The similarities were so numerous that early Christian writers said that the older religion was invented by the Devil as a cheap imitation of Christianity before Jesus was even born!

The mithraeum is a long, rectangular room with benches to either side. Members would sit on these benches and share a communal meal that included bread and wine. At the end of the room stood a plaque showing Mithras in a little-understood ritual of killing a bull. Mithraism was popular, but didn’t have the widespread appeal of Christianity. First off, only men were allowed into the cult. Also, most of the teachings were secret, and while that had a certain mystique, it also turned off many who didn’t want to go through a long period of study and initiation. Despite this more than a dozen mithraea survive in Rome and there were probably hundreds during its heyday.

The transition from pagan to Christian isn’t always as obvious as in San Clemente. Sometimes you can see it in the art, such as the image above, a 4th century mosaic from Santa Pudenziana. Here Christ sits enthroned in a pose identical to many statues of the pagan god Jupiter. Saints Peter and Paul sit to either side dressed as Roman senators. The early Christians saw nothing wrong with this. They wanted to win the hearts and minds of the people, and a bit of reworked pagan symbolism was a good way to do that.

At times the Christians reused old buildings or parts of old buildings. San Maria Maggiore, a third century basilica, was originally a secular building before being converted into a house of worship. This is one of the most stunning churches in Rome, with fifth-century mosaics showing Biblical scenes and a ceiling gilded during the Renaissance with the first gold brought back from the New World. So many Roman sites are only foundations with perhaps a few columns standing, but here you can actually stand inside a Roman building.

Christianity would have never caught on so quickly if it didn’t have the Empire’s infrastructure to spread its message. These were the days when trying to cross a border could easily get you killed, and the Empire provided a large, secure area in which to move about. The Catholic Church understood their debt to Rome and wanted to take on its aura of glory and power. Rome went became the capital of the new faith and its art and architecture was incorporated into churches worldwide. The Church was still trying take on a bit of the old Roman magic as late as the 17th century, when the Pope ordered the giant bronze doors from the old Roman Senate installed in the entrance to St. John Lateran.

The name Roman Catholic Church is no accident.

Don’t miss the rest of my Vacation with the Dead: exploring Rome’s sinister side.

Coming up next: Saints’ relics in Rome!

The catacombs of Rome

“There were 500,000 people buried here,” my guide whispers.

She leads me down a dimly lit, narrow passage that seems to go on forever. To either side the rough walls are lined with small niches.

“These are where the bodies were kept. There are twenty kilometers of tunnels, and while most of the tombs are now empty, some are still unopened.”

We are in the Catacombs of Domitilla, one of the largest of a half dozen underground burial places dug out by Christians during the second and third centuries AD, when most of the Roman Empire was still pagan. My guide, a knowledgeable young Polish woman, is leading me through a warren of passageways, rooms, even subterranean churches. Incredible facts drop from her mouth every minute.

“This is the oldest of the catacombs with some of the earliest Christian paintings anywhere. There’s even a painting of the Last Supper that’s 1,800 years old.”

The frescoes are tucked away in little vaults built by wealthy families, or on the domes of small mausoleums. They show simple Christian scenes–the Good Shepard, baptism, the saints, painted in a capable but not overly talented hand.

“Since most people were pagan, the early Christians had trouble getting good artists. You can see it with the inscriptions too. They’re not done in orderly lines and clear letters like you see on monuments above ground.”

Somehow that makes me like them more, that these paintings were done by common people, not famous artists. The ones showing prayer are the most evocative because they seem to portray real individuals as they looked in life. They all take the same pose–with arms flexed outwards, palms up.

“This is how everyone prayed back then, both pagans and Christians,” my guide explains.

“Shi’ite Muslims still start their prayers in that pose,” I say.

She gives me a narrow look before leading me down another hallway. We pass a vertical shaft where we can still see small footholds cut into the side for the original builders to climb to the levels above and below us. The walls and ceiling of the tunnels are rough, with traces of the last cuts of the pick clearly visible. The stone is volcanic tufa, a rock so soft that it can be scraped with a fingernail, yet compact enough that it can support an immense amount of weight.

My guide stops in the middle of the hall and points to the wall.

“Look, this one is still buried here.”

One of the niches is sealed up with a rectangular slab. I know I’m not supposed to touch but I do anyway, pressing my hand against the cool, damp stone. Inches beyond my warm flesh lie the cold bones of one of the earliest followers of the world’s biggest religion. What I’d give to talk to him or her for just five minutes. My guide notices what I’m doing and smiles.

“Most of the bones were removed in the Middle Ages to protect them from relic hunters, but a few hundred tombs still remain unopened,” she explains.

%Gallery-102540%Sadly this slab is blank. Some have the person’s name carved on them. In some sections of the tunnel fragments of these tomb facings have been plastered onto the wall by later hands. The earliest inscriptions are in Greek, the language of the New Testament. Later ones, dating to the fourth century when Christianity became the religion of the Roman Empire, are in Latin.

Pagan Romans cremated their dead, but Christians believed in resurrection and practiced burial so the body could rise up on Judgment Day. The Roman Empire was generally tolerant of other religions, incorporating new gods into the existing pantheon, but it looked upon monotheistic Christianity and Judaism with mistrust. While followers of Jupiter or Mithras or Ra acknowledged the existence of other gods, the monotheists dismissed all other gods as impostors or demons. Even worse, they refused to sacrifice to the deified emperors. Several emperors persecuted them, although the extent and violence of these persecutions have been exaggerated by early Christian chroniclers. The image of thousands of Christians being thrown to the lions is myth. People were sometimes killed, but more often their churches would be destroyed and property confiscated. The main victims were church leaders like bishops and early popes, some of whom are buried here; regular Christians were generally left alone. Many of the biggest catacombs were built right under the Appian Way, the main road leading into the city and lined with the tombs of wealthy pagans. While everyone knew where they were, most pagans were content to leave the Christians to their strange rituals as long as they kept out of sight and didn’t cause trouble.

Two other networks of catacombs along the Appian Way are popular with visitors. The Catacombs of San Callisto are as impressive as those of Domitilla and have several good frescoes. The Catacombs of San Sebastiano, under the church of the same name, are smaller and less well preserved, yet there’s an interesting room used for funeral banquets where early Christians carved their names or the names of their departed loved ones along with prayers. All three catacombs can be seen in a single day.

The catacombs stay at a constant 15°C (59°F), so it’s best to bring a long-sleeved shirt or light sweater. Photography is not allowed. I won’t ask how GerardM at Wikimedia Commons got the above image, or how the photographers who took the pictures of the frescoes in the attached gallery got theirs. I’ll assume they went through the red tape to get permission from Papal Commission of Archaeology. I’ve heard that if I do the same I can get a papal archaeologist to guide me through parts of the catacombs closed to regular visitors. My guide warns me I need a valid reason and lots of patience with bureaucracy. Perhaps next year I’ll be back.

“We’re nearing the end of the tour,” my guide says, “but I have one last thing to show you.”

We come to a large, empty tomb that has been converted into a display case for artifacts found by the archaeologists. Through the metal grille I see oil lamps the Christians used to find their way through the dark, shells that were pressed into the wall near a tomb to help identify the occupant, and bits of cheap glass jewelry.

In one corner are a collection of little ceramic animals, dolls, and rattles, simple toys put in front of the graves of children.

Don’t miss the rest of my Vacation with the Dead: Exploring Rome’s Sinister Side.

Coming up next: The Death of Paganism!