The _North Choir Aisle_ follows the architecture of the choir. Here once stood the famous shrine of St. Wilfrid. The _South Choir Aisle_ is very similar to the opposite one. Here is a lavatory, and a piscina at the east end marks the site of a former altar. Above the west bay was a chantry chapel, now used for part of the organ. There is a monument in this aisle to Dean Fowler (1608). On the south is the _Chapter-House_ and _Vestry_. The _Crypt_ below formed part of the Early Norman church existing here before the rebuilding by Archbishop Roger. It is generally attributed to Thomas of Bayeaux (1070-1100). The vault is supported by square pillars with plain capitals. The windows have a double splay, which is a sign of almost Saxon work. The east end is apsidal. This crypt was formerly filled with bones. There are some interesting stone coffins preserved here. Returning to the _Chapter-House_ we notice the stone benches where the canons once sat in conclave. The vaulting is very fine, of Late Transitional work, almost Early English. This chamber was built by Roger. An arcade runs along the north wall. The windows are circular, the piers round, and have circular bosses and capitals. Some curious fifteenth-century alabaster carvings are preserved here, the subjects being St. Wilfrid, the Coronation of the Virgin and the Resurrection. The _Vestry_ is evidently of the same date as the chapter-house, and once formed part of the same building, the partition wall being much later. It has an apse with the remains of an altar and the treasury occupied the apse on the south. Above these chambers is the _Lady Loft_, the date of which is uncertain; it was probably built about 1330, and is Decorated in style. It is strange to find a Lady Chapel in this position. The room is now the library. It possesses some interesting incunabula and a few MSS. Dimensions Total length 270 ft. Length of nave 133 ft. Breadth of nave 87 ft. Height of nave 88 ft. Length of choir 95 ft. Height of tower 110 ft. Length of transept 130 ft. Area 25,280 sq. ft. PRINCIPAL BUILDING DATES Saxon--Wilfrid's crypt. Norman (1070-1100)--Portions of chapter-house, vestry and crypt below. Transition (1154-1181)--Three bays of north side of choir, portions of nave, piers adjoining west and central towers, transepts. Early English (1215-1255)--West front and west tower, vaulting of chapter-house and windows. Early Decorated--Two eastern bays of choir and east window. Perpendicular--South and east sides of central tower, east side of wall of south transept, two bays south side of choir, nave.