Another change was necessitated by an event which took place on St. Paulinus' Day, October 10th, of the year 1323. For on that day a calamity such as had never before happened befell the church. The celebration of Mass at an altar of the Blessed Virgin was just over, a great multitude of people, men and women, still being in the church, when two of the Norman piers of the main arcade on the south side fell outwards one after the other with a great crash, and about the space of an hour afterwards the wooden roof of the nave which had been supported by these columns also fell; the piers themselves had crushed the south wall of the aisle and the cloisters, so that a complete wreck was made of the south-eastern part of the church westward of the tower. But this disaster was accompanied by a great marvel, for though many persons were standing close by, not one was injured; and a still more wonderful thing is recorded: the monk whose duty it was to guard the shrine of St. Amphibalus, which at that time stood in the nave, had been celebrating at the altar--he had finished even to the washing of the sacred vessels--when he saw the columns fall; he withdrew a little from the altar and received no harm. Some of the wreckage fell on the shrine of St. Amphibalus, and though the marble pillars supporting the canopy were broken, yet the chest which contained his relics suffered no harm. This wonderful preservation of life and limb and shrine was naturally attributed to the intervention of the blessed martyr St. Amphibalus.