The church begins with a mission. Around the year 690, an English monk named Willibrord crossed the North Sea with the blessing of Pope Sergius I to evangelize the Frisians. He chose Utrecht as his base, and by 724 the presence of a church here dedicated to Salvator, the Savior, is firmly documented. The naming was deliberate: the mother church of all Catholic Christianity, the Basilica of St. John Lateran in Rome, had originally borne the same dedication. To call your church Salvator was to claim a direct line to Rome itself. For three centuries it served alongside a smaller building nearby, the Holy-Cross chapel, which was probably the original St. Martin's. Together, those two stones formed something rare in northern Europe: a double cathedral, two churches functioning almost as one, with the bishop's seat eventually settling in St. Martin's and leaving Salvator to its own quieter dignity.

By the eleventh century the church had been rebuilt in the grand manner. Bishop Ansfried added a western fortress-front in conscious imitation of Charlemagne's Palatine Chapel at Aachen. Bishop Bernold and his successor William carved away the old eastern annex and replaced it with a transept and a strikingly deep choir, and beneath that choir, a spacious crypt. The depth was the giveaway. This was not just architecture, it was reliquary. The first bishops of Utrecht were buried here, and tradition placed among them Saint Boniface, the Anglo-Saxon missionary martyred at Dokkum in 754. Before the crypt's altar of Saint Stephen lay Bishop Frederick of Utrecht, who was murdered inside this very church in 835. Legend blamed Empress Judith of Bavaria, angered by Frederick's criticisms. The bishop's tomb sat where the assassin had struck. To walk into the Sint-Salvator was to walk among the founders of Christian Utrecht, still present beneath your feet.

Buildings of stone are not immune to fire. The roof timbers, the wooden fittings, the great rope-hoisted lamps - all of it burned in 1131, and again in 1253. Each time the church rose again, this time in Gothic taste layered over the older Romanesque bones. A school appeared at the south side of the tower, a library beside the choir. The complex grew into a small city of canons, books, and altars. Then came 1580, and the slow, irreversible turning of Utrecht toward the Reformation. Catholicism became illegal in 1587. The Sint-Salvator, the Old Munster of the city, was demolished in the months that followed. Most of its foundations were torn out and carted away. The bones beneath the choir, the centuries of accumulated memory, the stones quarried from German tuff and shaped by medieval masons - all of it scattered or buried.

We know what the church looked like only because Aernout van Buchel, a Utrecht antiquarian and humanist, drew it. His map and elevations were made either just before the demolition or, more poignantly, just after, from memory and surviving stubs of wall. In 1592, Canon Jan Mersman wrote a description. Together these two men, working in the smoke of a religious revolution, preserved a building that no one else thought worth saving. Three centuries later, during the German occupation of the Netherlands in World War II, archaeologists dug at the Domplein and found exactly what Van Buchel had promised: limestone sarcophagi on the old church's axis, walls of the eastern annex, the geometry of a grave chapel. The dimensions matched. The drawing had been right.

Today the Domplein is one of the most haunted squares in the Netherlands, in the literal sense that the things which made it the heart of the city are mostly invisible. The Dom Church - St. Martin's, the survivor - still stands on one side, its tower the tallest in the country. The Sint-Salvator is the absence opposite. The paving stones trace the outline of the choir and part of the transept; standing on them you can pace out the deep choir that once held bishops, walk the crossing, find the tower-line of the westwork. The square reads as a memorial to itself. A thousand years of one church, undone in a year, surviving now only as a footprint, a drawing, and the bones still resting beneath the cobblestones of a Dutch city square.