In the North of northamptonshire, bordering on Leicester and Rutland, is the elevated tract of land bounded N.W. by the Welland river, and S.E. by the Nene, called Rockingham Forest, and on its N. side, toward the former river, on a rock or spur of the hill, is this castle, protected on both sides by steep ravines, a situation of strength that, in very early days, recommended it for a stronghold; hence we find in Saxon times a chief named Bovi had his dwelling here on a lofty mound, which, as elsewhere, caused it to be chosen by the Conqueror for the site of a Norman shell keep. This mound is now 100 feet in diameter at top, and is 30 feet high, having a broad and deep ditch round its base; it stands at the S. of a plot of flat land on which the main castle buildings, with their wards, were afterwards ranged; and from the mound westward extended a line of wall, of which the greater part remains along the edge of the ditch and ravine northward, and round on the E., enclosing the buildings and courtyards. This curtain wall is well buttressed and hits circular mural towers at the angles, with the great entrance gatehouse on its E. face.