The North Choir Aisle is a foot narrower than the corresponding south aisle: it has three windows each with two lights instead of two of three lights. This is known as St George's aisle. In the east wall is a piscina of Perpendicular date. Two doors lead into this aisle—one at the corner, where the walls of the aisle and transept meet, and one between the two easternmost windows. The principal objects in this aisle are two bulky chests, one containing the title-deeds of some charity lands in the parish of Corfe Castle. This is fastened by six locks, each of different pattern,—each trustee of the charity has a key, of his own special lock,—so that the chest can only be opened by the consent of the whole body. The other chest contains the parochial accounts; this once had six locks, but now has only two.
In the south-eastern corner of this aisle lies a mutilated effigy of a mail-clad knight with crossed legs. This is said to have been removed to the minster from another church when it was destroyed. Whom it represents is uncertain, but traditionally it is known as the Fitz Piers monument.
In this aisle is the monument of Sir Edmund Uvedale, who died in 1606. The monument was erected by his widow in "dolefull duety." It is in the Renaissance style, and was carved by an Italian sculptor. The old knight is represented clad in a complete suit of plate armour, though without a helmet. He lies on his right side, his head is raised a little from his right hand, on which it has been resting, as though he were just awaking from his long sleep, his left hand holds his gauntlet. Above the tomb hangs an iron helmet, such as was worn in Elizabethan times, and which very probably was once worn by Sir Edmund himself.
Between the eastern ends of the choir aisles, and beneath the eastern end of the presbytery, is the Crypt. This is a vaulted chamber, the vaulting being supported on two pairs of pillars, thus forming three aisles, as it were, running east and west, each containing three bays. The western bay is of somewhat later date than the central and eastern; the wall against which the westernmost of the pillars once stood was removed, but the piers were allowed to remain, backed up by a new piece of masonry built against them to support the new vaulting. The crypt is lighted by four windows, equal-sided spherical triangles in shape; two look out eastward, one northward beyond the chancel arch, one, correspondingly placed, to the southward. The centre of the east end is a blank wall. Against this the altar stood—a niche, probably a piscina, still may be seen. On each side of the place where the altar stood there are two openings into the choir aisles. The exteriors of these are of the same form and size as the crypt windows, but they are deeply splayed inside, and probably were used as hagioscopes or squints, to allow those kneeling in the choir aisles to see the priest celebrating mass at the crypt altar.