From this time onward the architectural history of the cathedral becomes less important. Its great periods may thus be summed up, 1107 to 1206 Warelwast and Marshall built the Norman church; 1257 to 1280 Bronscombe and Quivil began the Decorated work; 1292 to 1308 Bytton and Stapledon completed the eastern part; 1327 to 1369 Grandisson and Brantyngham completed the nave, west front, and cloister. The fifth and last change is the introduction of Perpendicular work, chiefly noticeable in the chapter house, the west screen, and the great east window. The day of the great builders was waning fast. The old faith that inspired them was dwindling, the attraction of national concerns was too great for local effort. Moreover, the desire to make intricately beautiful, right enough in itself, had vitiated, as it was bound to do, the taste of architect and builder. The old Norman cathedrals, however rugged, were imposing in their stern and simple strength. The desire for decoration affected various transformations, which at first left the building more beautiful and not less strong. But gradually the simplicity and strength disappear altogether. Luckily, as we shall see, the great church of St. Mary and St. Peter has suffered less than most buildings that have undergone so many changes. "As it is, the church of Exeter is a remarkable case of one general design being carried out through more than a hundred years." The church is Quivil's design, and the variations, though important, do not seriously detract from it.