Santa Sabina was finished around 432, and it is the one church in Rome where you can see what a church looked like then. A priest from the Dalmatian coast built it on the Aventine hill. Twentieth-century restorers stripped away the altars, plasterwork and gilding that later centuries had added, so the interior is a wide white hall again. Twenty-four matching ancient columns carry round arches down both sides. The windows hold thin sheets of selenite rather than glass, and this crystal lets a soft, slightly milky light into the nave that makes the whole room glow evenly.
The doors are older than almost anything inside. Carved in cypress wood around 430 and still hanging in the entrance porch, they hold eighteen surviving panels of biblical scenes. In the top left corner, three men stand with their arms out against a wall: Christ and the two thieves. It is generally accepted as the earliest surviving image of the Crucifixion, made at a time when Christians still avoided showing the cross at all. The porch is dim, the panel is small, and most visitors walk past it into the nave without looking up.