The North Aisle of the Choir, again, shows the joining and harmonising of the "new work" of the eastern transept with the earlier Norman work. Inside the church the most easterly bay appears to be altogether of Early English date; but on the exterior it will be seen that the Norman wall runs right up to the western wall of the eastern transept. The interior of the bay, however, is enriched with a wall arcade similar to that in the Nine Altars Chapel, and the arch and vault are decorated with foliage and dog-tooth ornament.
Along the side wall of this aisle runs a stone bench bearing the arms of Bishop Walter de Skirlaw (1388 to 1405), near which he was buried, but his monument and brass, erected by himself, have disappeared.
Slightly westward of the bench is a doorway which at one time opened into the Sacrist's Exchequer, erected by Prior Wessington, but it has long ago been destroyed.
The piers of the west end of this aisle bear marks which were originally holes cut in the stone. These served to support a porch, having a rood and altar, which is thus described in the "Rites of Durham":
"Right over the Entrance of this North Alleye, going to the Songe Scoole (the Exchequer mentioned above) there was a porch adjoyninge to the quire on the South, and S. Benedick's altar on the North, the porch having in it an altar, and the roode or picture of our Saviour, which altar and roode was much frequented in devotion by Docteur Swalwell, sometime monk of Durham, the said roode havinge marveilous sumptuous furniture for festivall dayes belonginge to it."
The South Aisle Of the Choir is similar architecturally to the north aisle. Here may be seen a doorway, of late thirteenth-century work, which originally led to the revestry, now destroyed.
Here again the eastern piers bear marks left by holes in the stonework, which originally earned the supports of a screen, in front of which the Black Rood of Scotland, which was taken from King David at the battle of Neville's Cross (1346), was placed. The rood is described as having been brought from Holyrood by David Bruce, and was made of silver, with effigies of our Saviour, S. John, and Our Lady, having crowns of gold on their heads. The Black Rood was restored to its original possessors at the close of the war.
The windows of both the choir aisles originally contained very fine old stained glass, representing various saints, and scenes in the life of S. Cuthbert.