The present lierne vault was added by Bishop Goldwell (1472-99), and his rebus, a gold well, can be seen cut on the bosses at the intersections of vaulting ribs. The curious junction of the later vault with the ogee-shaped arches of the clerestory should be noticed.
While the original triforium yet remains, the character of the main arcade was altered by the insertion of the four-centred "Perpendicular" arches, the work of Bishop Goldwell, whose tomb is under one on the south side. These lower arches were filled with screens, removed in 1875.
The lower apsidal arches, in the beginning of the century, were completely filled with imitation Norman work; this has been cleared away to the original height of the screen wall, with much improvement to the general effect.
The present altar, designed by Sir A.W. Blomfield, occupies probably the position of the original altar. The question where the high altar stood has provoked much speculation. Professor Willis placed it more to the westward, thinking that a quatrefoiled opening or hagioscope in the screen wall of the last bay on the north side of the Presbytery (marked 9 on [plan]) was made to afford a view of it from the aisle. Harrod points out that there is a small hole in the vault above, from which probably hung down the light of the sacrament. The position of this hole, and the fact that such a light would necessarily be placed before the altar, and not over or behind it, is evidence that the altar was about where it is now. Blomfield, again, averred that the people stood in the aisle and confessed to the priest standing in the sanctuary, the "voice coming through a hole made in the wall for that purpose," the hole being the hagioscope referred to. But, as Harrod observes, to do this the priest must have assumed a recumbent position, which is neither convenient nor usual.
The real use, no doubt, of this bay of the arcade, was for the Easter sepulchre; its usual position is on the north side of the sanctuary. It will be noticed also that in the aisle immediately behind is a raised gallery of Decorated character, access to which was gained from the sanctuary by steps on the left side of the bay of the arcade, in which occurs the hagioscope. This gallery formed the ante-chapel to the Reliquary Chapel, which projected northwards from the aisle of the cathedral; the roof line of this chapel can be seen plainly from the outside. From the reliquary chapel on Good Friday the crucifix and pyx were taken out and deposited in the Easter sepulchre below; and from the vault above, through the hole before referred to, was hung the great sepulchre light. More probably the hagioscope was intended to be used by the watcher at the sepulchre.
The arrangement of the presbytery, as we have already noted when referring to the plates here reproduced from Britton, has undergone many changes; in the beginning of the century the level of the floor of the choir was continued until between the third and fourth bay from the tower in the presbytery, where it rose by five steps to the level of the sanctuary floor. Harrod speaks of two steps up at the third pier past the tower, and three at the fourth or point of the junction of the apse. In Dean Goulburn's time, the sanctuary space was enlarged by being brought forward one bay. The present floor, designed by Sir A.W. Blomfield in glass mosaic and porphyry, was executed by Powell Brothers. Then also was added the somewhat elaborate communicants' rail, executed in bronze and spars. In enlarging the sanctuary, Dean Goulburn moved the three steps from the fourth pier past the tower to the third, and at the same time the two steps at the third pier were moved forward to the first past the tower. And now again, during the recent works of reparation, the presbytery floor has been brought forward at one level to the tower arch, where it descends to the level of the choir floor by five steps: screens which filled the first bays on either side were removed, and similar flights of steps now descend from the presbytery and the north and south aisles. The cumbrous stalls were also removed, and in part refixed in the nave.