Collegiata di Santa Maria Assunta

Climb the broad stone steps from the square, and notice how plain everything looks. The facade is bare brick and stone, almost severe, with two simple doorways. Swallows cut across the piazza. Voices drift up from the café tables below. Nothing out here prepares you for the colour waiting inside. When you step through the door, the light drops, the air cools, and your eyes slowly adjust... to walls covered from floor to ceiling in painted stories.

This is the Collegiata di Santa Maria Assunta, the main church of San Gimignano. Locals often call it the Duomo, the cathedral. Strictly speaking, though, it has never been a cathedral, because San Gimignano never had its own bishop. Instead, a college of canons served the church. A canon is a priest who lives and prays as part of a community. That group gives the building its name. It is a small detail, but it says a lot about a proud town without a bishop.

The church is Romanesque. That is the style of medieval Europe before the Gothic age, with round arches, thick walls, and a calm, heavy rhythm. The building was consecrated in the twelfth century, when San Gimignano was growing rich. Pilgrims and merchants passed through on the Via Francigena, the great road that led from northern Europe down to Rome. Trade in saffron and cloth brought money into the town. Much of that money ended up here, on these walls.

Look up first. The vaults above the nave are painted deep blue and scattered with golden stars. Below them, the arches carry bands of alternating light and dark stone. The effect is like standing inside a striped, star-lit tent. Then let your eyes travel down to the side aisles. Every surface tells a story. For medieval worshippers, many of whom could not read, these walls worked like an enormous picture book of faith.

On the left side as you face the altar runs the Old Testament. This cycle is the work of the Sienese painter Bartolo di Fredi, from the fourteenth century. Start near the entrance and follow the scenes. You will find the Creation, Adam and Eve, Noah and his ark, and the long story of Job. Bartolo loved small, lively details. Watch for animals, boats, and faces that look surprisingly like ordinary townspeople of his time.

Across the nave, on the right side, runs the New Testament. These scenes show the life of Christ, from his birth to the Passion and the Crucifixion. For a long time they were credited to a painter called Barna da Siena. Today many scholars link them instead to the workshop of Lippo Memmi, another Sienese master. Here is the first surprise for many visitors. The two walls face each other on purpose. Old promise on one side, fulfilment on the other.

Now turn around and face the entrance wall. Here, above and around the doors, is a dramatic Last Judgement by Taddeo di Bartolo, painted near the end of the fourteenth century. Paradise sits on one side and Hell on the other. The Hell scenes are frank and quite graphic. Sinners are punished in ways that match their sins, and some details are shocking even today. Medieval visitors left the church with these images fresh in their minds.

On the same wall you will find a gentler image. It is Saint Sebastian, painted by Benozzo Gozzoli in the fifteenth century. Sebastian was a Roman soldier and martyr, and people prayed to him for protection against plague. The town commissioned this fresco after an outbreak of disease. Notice how calm the saint looks, even pierced by arrows. Above him, angels and the Virgin spread a sheltering cloak over the faithful below.

Near the entrance wall stand two painted wooden figures of the Annunciation, the moment when the angel Gabriel tells Mary she will bear a child. The figures are carved by Jacopo della Quercia, a major sculptor from Siena, and painted by another artist. Wood is fragile, and few medieval statues like these survive in such good condition. Stand between them for a moment. The angel and the Virgin seem to speak across the space of the church.

Now walk toward the right side of the church, to the Chapel of Santa Fina. This is the second great surprise. The chapel is pure Renaissance, light and orderly, a world away from the crowded medieval walls. It was designed by the brothers Giuliano and Benedetto da Maiano in the fifteenth century. The frescoes inside are by Domenico Ghirlandaio, the Florentine painter who later trained the young Michelangelo in his workshop.

Fina was a young girl of San Gimignano in the thirteenth century. According to local tradition, she fell gravely ill and spent years lying on a hard wooden board, accepting her suffering without complaint. Legend has it that when she died, the church bells rang on their own. Locals say that violets bloomed on her wooden board, and yellow flowers burst out along the town's towers. Even today, people say those yellow flowers on the walls are Santa Fina's violets.

Ghirlandaio painted two scenes from her story. In one, Saint Gregory appears to announce her death. In the other, her funeral fills a church. Look closely at the background of the funeral scene. You can see towers of San Gimignano painted on the horizon, a view of the town as it looked in the fifteenth century. It is a small window into the past, framed within a sacred story.

As you finish, walk back slowly down the nave. Look again at the two long walls, one ancient, one new, facing each other across the stone floor. Then step out into the light of the piazza. The towers rise above you, the same ones Ghirlandaio painted. Look along the brick and stone for any yellow flowers. And remember that behind that plain facade, a whole painted world is waiting for the next visitor.