A rectangular building located off the E walk of the cloister of St Frideswide's priory (now Christ Church cathedral), Oxford. c.1230 in its present form, it has three rib-vaulted bays and 13thc windows towards the E. Romanesque masonry survives in the blind W bay. Two restored 2-light Romanesque windows in the W wall flank a sculpted Romanesque doorway. This shows traces of fire damage. The doorway is carved inside and out.

The claustral buildings of the priory, including the chapter house, were laid out probably c.1140. The lower courses of the doorway date from the 1190s, when the floor level of the cloister E walk was lowered 110 cm after the fire that is said to have engulfed the priory church in 1190.

The fire damage to the doorway was presumably inflicted by the event of 1190. The changes to the floor level left the windows set higher than normal. The interior sculpture and the windows were restored by Bodley and Garner, 1881. The interiors of the W windows are treated above; but since the windows are identical inside and out and fully recarved, the exteriors are not. The chapter house is now used as a shop, the fittings of which obscure some features including the lower parts of the windows.

The style of the doorway is linked to the style of Reading Abbey.