When, therefore, the Norman nave, as originally designed, was approaching completion, the designers determined upon an extension of the nave, and a much grander western finish to the church than had before been contemplated. This idea included a dignified western transept, the dimensions of which, from north to south, should exceed the entire width of the nave and aisles. This would of necessity involve the lengthening of the nave, because the monastic buildings came close to the south aisle of the nave, at the point where the original termination of the church was to have been, as may be seen by the old western wall of the cloister, which is still standing.
The two next abbots were Andrew (1193-1200), and Acharius (1200-1210). To one or both of these may be assigned the western transept. By their time the Norman style was giving place to the lighter and more elegant architecture of the Early English period, the round arch was beginning to be superseded by the pointed arch, and the massive ornamentation which marks the earlier style was displaced by the conventional foliage that soon came to be very generally employed. Most wisely, however, the Peterborough builders made their work at the west end of the nave intentionally uniform with what was already built. Very numerous indications of this can be seen by careful observers. The bases of the western pillars, the change in the depth of the mouldings, characteristic changes in the capitals in the triforium range, and especially the grand arches below the transept towers, which are pointed, but enriched with ornamentation of pronounced Norman character, all point to the later date of this western transept.
At the west wall of the church all trace of Norman work disappears. The arcade near the ground, the large round arch above the door, the great west window and its adjacent arches (not, of course, including the late tracery), are all of distinct Early English character. The whole of this wall may be held to be an integral part of the west front, and not of the transept which it bounds.
When we come to the most distinctive feature of the cathedral, the glorious west front, we find we have no help whatever from the chronicles. Nowhere is there the smallest reference to its building. Other works raised by the Abbots of the period are named, but the noble western portico is never once mentioned. Perhaps the rapid succession of abbots after Acharius may account for this. The building must have taken some years, and the credit of the whole cannot be given to one. There were four Abbots after Acharius before the church was dedicated. They were Robert of Lindsey (1214-1222), Alexander (1222-1226), Martin of Ramsey (1226-1233), and Walter of S. Edmunds (1233-1245). During the abbacy of this last the church was dedicated on the 4th of October 1237, (according to the Chronicon Angliæ Petriburgense), or on the 28th of September 1238, according to Matthew Paris. The Bishop of Lincoln, Robert Grostête, took the chief part in the ceremony, assisted by William Brewer, Bishop of Exeter. The other chronicle calls the second bishop suffragan of the Bishop of Lincoln, which may mean no more than that he assisted on the occasion. The dedication took place in accordance with the provisions of certain constitutions which had been drawn up at a council held in London. No doubt the building had before this been completed. This date agrees well with the period which all architectural experts accept as the probable date of the erection of the west front. It may have been, and probably was, finished some few years before the dedication. The very fine gables at the north and south ends of the western transept are of the same date as the west front.
Considerable changes in the fabric, as well as additional buildings, belong to the latter part of the thirteenth century. The documents mention two of these. In the time of Richard of London (1274-1295), but before his election to the abbacy, while he was still sacrist, the bell-tower was erected, in which were hung the great bells which were called Les Londreis, because he was himself a Londoner, and had caused them to be brought from London. A previous abbot, John of Calais (1249-1262), had contributed a great bell to the monastery, which he had dedicated to S. Oswald. On it was inscribed the rhyming hexameter Jon de Caux abbas Oswaldo consecrat hoc vas. The other great work of this period was a magnificent Lady Chapel, since destroyed, begun in 1272 by William Parys, then Prior, who laid the first stone with his own hand, and placed beneath it some writings from the gospels. He lived to see it completed, and at last his body was interred within it. Its altar was consecrated in 1290, as is recorded in the register of Bishop Oliver Sutton. It is described as having been built of stone and wood, with a leaden roof, and with glass windows. There was a statue of the Virgin, and round the walls, or perhaps in the stained glass in the windows, there were figures of those named in the genealogy, with a compendium of their lives beneath each. The Prior contributed five pounds of silver and upwards of his annual revenues towards the decoration of this chapel. From an engraving in Gunton's History, which may be taken as fairly representing its appearance, for it was standing in his time, although the drawing is manifestly inaccurate and must have been sketched from memory, we gather that the windows were of the same character as four which are still to be seen, three of them in the eastern chapels of the south transept, and the fourth on the north side, near the site of the Lady Chapel. These are all of excellent geometric work, and precisely of the date given. This chapel was built, as at Ely, to the east of the north transept. The position of the roof can be traced on the east wall of the transept; and it can be there seen how the Norman triforium windows were originally arranged. These being covered by the Lady Chapel, had not been altered like those in other parts of the church.
Other works of this century, not mentioned in the annals, are the entire removal of the lower stage of Norman windows in the aisles, these were replaced by wide windows of five lights each; the addition of a parapet to the apse; the erection of piscinas and other accompaniments to side altars, at the east ends of the choir aisles.
For the rest of the architectural history we have no chronicles to guide us, and are left to the stones themselves. But there is very little difficulty in fixing at least approximate dates for all the later work. The most important alteration in the fourteenth century was the removal of the stages above the four great arches of the central tower, and the substitution of a lighter lantern. When this was done, the great round arches east and west of the tower were changed into pointed arches, but those north and south were left unaltered. There is every probability that some signs of insecurity had made themselves evident. We have seen that three stages of the Norman tower were erected by Abbot William of Waterville. Though not so stated we infer from this that at least one more stage was afterwards added. In any case the tower must have been a very massive structure, considerably higher than the present one. In the early part of this century, in 1321, the great tower of Ely had fallen; and its fate may have warned the monks of Peterborough to see that the disaster was not repeated here. This alteration must have been made, judging by the details of the architecture, in the second quarter of the century. Above the lantern was a wooden octagon. The views that are given of this hardly warrant the admiration that has been sometimes expressed, or the regrets that have been uttered at its removal. It may have been designed to carry a wooden spire, such as was afterwards erected on the bell-tower. But most will agree with the criticism that it was "a low and unsightly structure." It hardly rose more than eight or ten feet above the top of the lantern, and the whole height of the central tower, including the octagon, was less than the height of the south-western spire of the front.
To this century belongs the transformation of the triforium windows all through the nave and choir. Parapets were at the same time added above the Norman corbel tables. The change effected in the apse was the most noticeable; not only were the two upper tiers of Norman windows replaced by Decorated ones of larger size, but the three lowest ones in the centre were altogether removed, and their place taken by lofty archways, when the new building was built. But we can judge of their appearance from the two side windows which still remain; these, being not now external, have had all the glass removed; but the mullions and tracery are perfect, and even the iron-bars across are still there. At the inner surface of the wall the five lower windows have very good hanging tracery, of different designs.
The south-western spire of the west front is also of this period, probably a little earlier in date than the lantern. This is of very remarkable beauty, and very much more elegant than the corresponding spire to the north. The triangular section of the pinnacles at the base of the spire, the crockets with which they are enriched, and the open canopies around, combine to produce a most graceful feature. To the latter years of this century may be assigned the central porch, with room above, inserted between the two middle piers of the west front. Some regard this as a blemish; others as a distinct improvement. One party maintains[[13]] that it is "an unsightly encumbrance, in its present position, seeing that it violates the uniformity of design displayed in the west front"; the other party contends[[14]] that it is "an extremely judicious insertion, and that it really does, just as if it was intended for that purpose only, restore its proper dignity to the central arch of the facade." It was most likely built as a matter of structural necessity, to secure the stability of the front. From a settlement of the foundations, or from a failure of the two central piers, or from the great weight of masonry above, for there are no western buttresses, the whole must have been in danger of falling. Mr Paley points out that the "construction of this elegant little edifice is extremely scientific, especially in the manner in which the thrust is distributed through the medium of the side turrets so as to fall upon the buttresses in front. These turrets being erected against one side of the triangular columns, on the right and the left hand, support them in two directions at once, viz., from collapsing towards each other, and from falling forward. The latter pressure is thrown wholly upon the buttresses in front, which project seven feet beyond the base of the great pillars." The room above is called by Browne Willis the Consistory Court. It is now used for the Minster Library.