On the death of Bishop de Lisle in 1361, Walsingham was elected bishop by the convent, but the election was set aside by the pope. This eminent architect was buried in the cathedral, but the precise spot is not known. The epitaph on his tomb has been preserved, and in it we find that he was buried "ante Chorum" (in front of the choir). This would mean the ritual choir as then existing, and would fix the place of his interment approximately at the spot where there is now a large monumental slab, from which the brass has been removed; and this has always been traditionally said to be the actual stone placed over his body. The brass represented an ecclesiastic with mitre and pastoral staff. The objection to this having been Walsingham's memorial, that these emblems could not have been correctly placed upon it, has been thus met: "On the other hand it is contended that although Alan died a Prior of the Convent, he had been elected Bishop by the Monks, though his election was overruled by the Pope, and that seeing to his successor Prior Powcher the Pope gave permission that he and all future Priors of Ely should wear the mitre and carry the crozier, it is possible that the Monks had anticipated somewhat the Pope's edict, and had represented their beloved Prelate with episcopal mitre on his head and crozier in his hand."[16] He well deserved the description in the epitaph, "Flos operatorum" ("The Flower of Craftsmen"). The rich woodwork in the choir--the stalls with their beautiful canopies--is also certainly Walsingham's work. Besides the great operations of this century there were various alterations and additions made in the cathedral of which the date is not recorded. The triforium in the presbytery was rearranged; the external walls were raised, and the Early English windows of Northwold's work were replaced by much larger ones with Decorated tracery. As the clerestory windows were not altered, the lean-to roof of the triforium was of course made much more flat than before. The graceful flying buttresses, with their elegant pinnacles, are of this same date. The character of Northwold's triforium windows and the corbel table below the parapet may be still seen in two bays on the south side. The aisle windows of the presbytery were also enlarged in the Decorated period; but they are not of the same design as the triforium windows, and they were probably not inserted at the same time. Judging by ordinary methods of discriminating dates by character and style, we should suppose the aisle windows to be earlier than those above; possibly some of this was done by Bishop Barnet (1366-1373). The whole designing is so unlike any of Walsingham's known work that we can hardly suppose that he was the author.