Remigius adopted the plan of the church at Rouen as the model of his foundation, which he laid in 1086. It was completed by his successor, Bishop Bloet. The accidental fire that broke out gave his successor, Bishop Alexander, the opportunity of repairing it. To prevent a like occurrence, this prelate conceived and carried out his idea of covering the aisles with a vaulted roof of stone. It had a disastrous effect in that its pressure weighed too heavily upon the walls. It necessitated a thorough overhauling by St. Hugh, a subsequent bishop, in the reign of Henry II. He rebuilt the church upon a plan then newly introduced, and greatly enlarged it by taking down the east end and re-erecting it upon a far bigger scale. Since his time the Cathedral has undergone several alterations and embellishments at the fostering care of several succeeding prelates. On the magnificent central tower there used to be a lofty spire, which was blown down in 1547. The two western towers were also deprived of their spires in 1808 to avert a similar calamity. The approximate dates of the different portions of the Cathedral are: [Illustration: LINCOLN BY MOONLIGHT] The central west front and the font belong to Remigius' period. The three west portals and Norman portion of the west tower above the screen to the third story are 1148. The nave, its aisles, and north and south chapels of the west end were finished in 1220. The Early English work of the west front and the upper portions of the north and south wings with the pinnacle turrets date from 1225. The west porch of the main transept is 1220. The lower courses of the central tower date from 1235, while the upper ones originated in 1307. The gables, the upper parts of the main transept, the parapets of the south side of the nave, the south wing, the west front, and the screen in the south aisle take us back again to the year 1225. The subsequent additions are: The west door of the choir aisles in 1240; the south porch of the presbytery in 1256; the choir screens in 1280, and ten years later the Easter Sepulchre. The fine circular window at the end of the north transept, and especially the ones in the south transept, attract considerable attention. They are called respectively "The Dean's Eye" and "The Bishop's Eye," and are supposed to belong to the year 1350. Perhaps they are better known as the rose windows, which were more popular in France than in England. They exhibit a network of interlacing stems in imitation of the freedom of the briar-rose, and show the advanced skill of the workmen upon the plate-tracery they formerly put up as a masterpiece in the close vicinity of the rose windows.