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 The Redangtdar Keep of a Mo7nnan Castle. 123 and no square keep ; the other a square keep which has absorbed the mound, if mound there was. At Belvoir, the mound, a natural hill, is capped by a shell, as were the artificial mounds of Bedford, Cambridge, Clare, Eye, and Ongar, while rectangular keeps are, or were, found at Chep- stow, Ludlow, Bristol and Wattlesborough, Lancaster and Newcastle, and on the moundless sites of Bamburgh, Carlisle, Corfe, Norham, Norwich, Nottingham, Porchester, Scarborough, Knaresborough, Helmsley, and Richmond, and in the less distinguished lordships, some of Norman founda- tion, of Appleby, Brough, Brougham, Bowes, Castle Rising, Clitheroe, Castleton, Goderich, and Prudhoe. Where there is a rectangular keep it rises high over every part of the fortress, and gives, as at Bamburgh, unity and grandeur to the architectural composition. It is usually, as at Rochester, Dover, Richmond, and Scarborough, placed upon the highest ground within the enclosure, and very rarely indeed in or near the centre, although, as in London, it may have been rendered central by the removal of its original enceinte and the substitution of new and extended lines. At Mailing, perhaps the earliest in England of these keeps, and at Helmsley, probably the latest, — for that of Knaresborough, though square, is of Decorated date, — the keep stands on one side of, and forms a part of the enceinte. At Bamburgh, Bramber, Canterbury, Carlisle, Clitheroe, and Rochester, the keep stands clear of, but very near to, the outer wall, of which, at Porchester, it forms one angle. At Kenilworth and Bridge- north the keep forms an angle of the inner wall ; at Norham one face ranges with the outer and one with the inner wall ; and at Ludlow the keep is placed on the inner wall, close to the main gateway. At Ogmore it occupies an angle, having one face on the outer and one on the cross or inner wall. Dover stands detached in the middle of what appears to be its original enclosure, and so, probably, did Hedingham and Castle Rising. At Mitford, near Morpeth, is a singular example of a rectangular keep, of which three angles are right-angled, and the fourth face is broken into two planes meeting at a low salient. It is probably late in the period. These keeps vary in dimensions from 25 feet to 80 feet and even 100 feet in the side, and they are usually from one and a half to two diameters in height to the base of the parapet. Many, perhaps most, have been raised a stage, as Porchester, Bridgenorth, Richmond, Brough, Brougham, Kenil- worth, and Norham. In most of these cases the addition was made within the Norman period, and possibly contempo-