The Boyana Church is really three churches stitched together across nine centuries. The eastern wing went up first, sometime in the late tenth or early eleventh century - a tiny cross-vaulted chapel built when Bulgaria was still a young kingdom. In the mid-thirteenth century, the Sebastocrator Kaloyan and his wife Desislava commissioned a second wing pressed up against the first, a two-story tomb-church meant to hold their family. The third and final addition came in the mid-nineteenth century, paid for by villagers from the Boyana quarter on the slopes of Mount Vitosha. Each addition kept the previous building's modest scale, so the whole compound feels intimate even now - a place built to be entered, not admired from across a plaza.

What the Boyana Master and his team painted in 1259 broke quietly with everything Byzantine art was supposed to be. The 89 scenes and 240 figures still follow the canon set by the Seventh Ecumenical Council in 787, but the people inside them refuse to behave like icons. Saint Nicholas saves a ship whose hull and sailors' caps recall the Venetian fleet of the painters' own century. Eighteen scenes from his life unfold like a story book. And on the north wall, the patrons themselves - Kaloyan, Desislava, Tsar Constantine Tikh, Tsaritsa Irina - look out with faces specific enough that an art historian named Elka Bakalova has called Desislava's portrait the most remarkable achievement of thirteenth-century painting, foreshadowing the Italian Renaissance. Giotto, born in 1267, was still eight years away when these brushes were laid down.

Orthodox tradition forbids the painter from claiming authorship. The icon is God's work; the human hand is only a vessel, and humility demands silence. So when restorers in 2006 lifted a layer of plaster from a wall in the Boyana Church and found the words I, Vasiliy inscribed, they were looking at something rare. The restorer Grigoriy Grigorov put it plainly: this painter knew that believers could not see his name, and inscribed it anyway. Whether Vasiliy was the master or one of his assistants, scholars still debate. But somebody, on a wooden scaffold by candlelight, decided his work deserved a name. The team itself is now called the Boyana Master, and their studio is associated with the Turnovo School - the artistic flowering of the Second Bulgarian Empire, of which this small church is the only fully preserved monument.

After the Ottomans absorbed Bulgaria in the late fourteenth century, the church survived the way small things survive - by being unimportant. Frescoes were touched up in the 14th century, then again in the 16th and 17th, and once more in 1882. In 1979 UNESCO added the church to the World Heritage List. Then in 1954, alarmed by what centuries of soot, breath, and humidity had done, conservators closed the building entirely. It stayed closed for half a century. When the Culture Minister reopened it in October 2008, it came with strict rules: groups of no more than eight visitors, ten minutes inside, the temperature held at 17 to 18 degrees Celsius, the lighting dialed low so that no warmth would lift from the lamps to disturb the paint. You stand close enough to see Desislava's eyes. Then your ten minutes are up.

Above the dome, Christ Pantocrator presides over a host of angels. Below him, the Four Evangelists stand in the pendentives. There are church fathers, warrior saints, the Virgin enthroned, the deacons Laurentius and Stephen and Euplius. There is the oldest known image of Saint John of Rila, Bulgaria's patron monk, painted while his cult was still young. None of this is what makes Boyana famous. What makes it famous is the human faces - the artist who looked at real people in his own century and decided their faces were worth the wall. Eight centuries later, on a slope of Mount Vitosha just south of Sofia's sprawl, those faces are still there, still specific, still patient with the few visitors allowed near enough to meet their eyes.