The oldest and most remarkable of the Derbyshire castles is that of Castleton or Peveril in the Peak, with its small but strong rectangular keep, built on the edge of the precipice, at the base of which is the celebrated cavern, one of the marvels of the Peak. Bolsover, now nearly all rebuilt, was also a Peveril castle. Of Sheffield, the castle of the Furnivals and Talbots, placed upon the junction of the Sheaf and the Don, nothing now remains. There seem to have been early castles, or perhaps fortified houses, at Codnor, a Zouch seat, Melbourne, and Gresley. Also Bogis and Hareston were Derbyshire castles in the reign of Henry II. The wide expanse of Yorkshire contained much worthy of defence, and was inhabited by a race of men not indisposed to provide it. The mounds of York, both of the first class in bulk and elevation, were posted on either bank of the Ouse, here a deep and broad stream. Of these mounds, one stands on the junction of the Foss with the Ouse, above a tract of marshy ground, between it and the wall of the Roman Eboracum. Here the Conqueror placed his first castle, and in the keep and within the spacious area below he posted William Malet and his 500 knights and their followers. Amidst much of modern work the old walls may still be traced, and a very fine shell, though of Early English date, still stands on the summit of the mound. The other mound, the Bayle Hill, south of the river, and connected with the earthworks of the later city, was also fortified by William, but in haste and with timber only, which does not appear ever to have been replaced with masonry. The city is strongly fortified with walls and a ditch, and the celebrated gateways or bars contain each a nucleus or core of Norman masonry. Next to York in importance is Scarborough, the stronghold of William le Gros, Earl of Aumarle, and the citadel of Holderness. The castle may be said to contain the whole table top of a rocky promontory, defended on three sides by a precipitous cliff, at the foot of which is the German Ocean, while towards the land is a deep natural depression. The approach was over a narrow causeway, raised upon arches, broken in the centre by a drawbridge and bridge tower, covered at the outer end by a strong barbican, and terminating below a lofty rectangular keep, much of which still remains, and by the side of which was the final entrance, and probably another drawbridge. In the words of Robert de Brunne— “Was there none entree That to the castle gan ligge But a straight causee At the end a drawbrigge.”