Arian Baptistery

Before you look up, notice the ground. The small brick building in front of you sits lower than the street around it. You step down to reach it, as if the city had slowly risen around a room it decided to keep. The air inside is cool and still. The light is soft, and it gathers in one place, high above your head, where gold catches every bit of brightness the windows let in.

This is the Arian Baptistery. It was built in Ravenna around the end of the fifth century and the beginning of the sixth. That was a strange and remarkable moment for this city. The western Roman Empire had collapsed, and Ravenna, once an imperial capital, now answered to a Gothic king. His name was Theodoric, and he ruled the Ostrogoths, a Germanic people who had settled in Italy.

Theodoric and his people were Christians. But they followed a different form of Christianity from most of the Roman population around them. They were Arians. The name comes from Arius, a priest from Alexandria, in Egypt. He taught that Christ, the Son, was created by God the Father, and so was not fully equal to him. Church councils condemned this idea as heresy. Even so, it spread widely among the Gothic peoples.

So in Ravenna, two Christian communities lived side by side. Each had its own bishop, its own cathedral, and its own baptistery. The Roman majority already had theirs, known today as the Neonian Baptistery, or the Baptistery of the Orthodox. The Goths built this one for themselves. It stood beside their own cathedral, the church that is known today as Santo Spirito, just a few steps from where you are standing.

Look at the shape of the building. It is an octagon, with eight sides. This was a common shape for baptisteries in the early Christian world. Many writers of the time linked the number eight with new life and resurrection. The idea was simple: seven days make a week, and the eighth day stands for a new beginning. Baptism was that new beginning, so the shape of the room carried the meaning of the ritual.

The walls are plain brick now. Over the centuries they lost the decoration they once had. Only the dome kept its mosaic, and that is where your eyes belong. Tip your head back. In the centre is a round scene set against a field of gold. It shows the baptism of Christ in the River Jordan. Every piece of that image is made from small cubes of coloured glass and stone.

Now comes the first surprise. Christ stands in the water, and he is shown nude. He is also young and without a beard. Many visitors do not expect this in a church. The water rises around his body, almost transparent. Above his head, a white dove pours water down onto him. The dove stands for the Holy Spirit. The whole scene is calm and quiet, with no sense of hurry.

On the right stands John the Baptist, dressed in an animal skin, with his hand raised over Christ. On the left sits an older man with white hair and a long beard. He is not a saint at all. He is the River Jordan itself, shown as a person. This idea comes from Roman art, where rivers were often painted as old gods. Here, a pagan tradition sits peacefully inside a Christian picture.

Around the central scene, a wide ring runs all the way round the dome. In it walk the twelve apostles, each holding a crown or a cloth in his hands. They move in a slow procession. Two figures lead them from opposite sides: Saint Peter, holding the keys, and Saint Paul, holding a scroll. They walk toward a single point in the circle. Follow their steps with your eyes.

They are walking toward a throne. And here is the second surprise. The throne is empty. On its cushion stands a jewelled cross. This image appears in early Christian art and is often called the prepared throne. It points to the return of Christ, a seat waiting for its occupant. In a building made for beginnings, the dome also looks toward the end of time.

If you have already visited the Neonian Baptistery, the design will feel familiar. That one is older, and its dome also shows the baptism surrounded by apostles. The Arian builders followed a similar plan. Art historians often compare the two domes closely. They look for small differences in style and in the details of the figures. Comparing the two is one of the quiet pleasures of a day in Ravenna.

The Gothic kingdom did not last. In the sixth century, the armies of the eastern Roman emperor Justinian took Ravenna back. Arian worship was suppressed, and the Arian churches were given to the orthodox Church. This baptistery was turned into a small chapel dedicated to the Virgin Mary. Its use changed, but the mosaic in the dome stayed. Today the building is part of the group of early Christian monuments of Ravenna listed by UNESCO as a World Heritage Site.

Before you leave, stand still for a moment under the dome. Look again at the gold, and at the young figure in the clear water. Then step back up toward the street, and notice the difference in level once more. That small climb is part of the story. Ravenna has slowly sunk and been rebuilt above itself. And this little octagon, from the age of a Gothic king, is still here.