The tiny roofless oratory, known as the Priests' House, lies to the SW of the cathedral. Its internal dimensions are 4.40 m by 2.33 m. There is a narrow door in the S wall and a curious blind arch in the E wall, the latter decorated with Romanesque ornament. As Leask noted, except for the first two or three courses of masonry, the structure is a restoration. Unfortunately the Office of Public Works based their reconstruction in the 1870s on Beranger's drawing of 1779, which did not give an accurate impression of the medieval building.