The second half-round tower is 64 feet from the former, and projects to the south into the court, commanding the inner face of its entrance, and the approach to the keep. In it, below the ground level, but not much lower than the level of the court below, is a circular dungeon 25 feet deep, into which Edward II. is said to have been finally thrust. The third tower is 50 feet from the second, and projects to the south. Here also has recently been discovered a chamber somewhat similar to the dungeon already mentioned, also not vaulted, and of very rough masonry, as though a mere foundation intended to be filled up with earth. These two last towers are blocked in by later masonry, the first within, the latter both within and without, as it projects into the buildings of the gateway. As this tower could never have been intended to be thus concealed, it points to the conclusion that the keep was built before the wall of the inner court. Besides these three half-round towers is a fourth, rectangular, and a much larger work, to the north, forming a part of the exterior line of defence. This is known as Thorpe’s Tower, and the family of that name are said to have held their adjacent estate of Wanswell by the tenure of its defence. This tower is 64 feet long by 17 feet deep. It forms a part of the curtain, having a very slight interior projection. At each end it expands into a square turret, that to the west 17 feet, that to the east 20 feet. The western turret and the body of the tower are thought to be solid, which is very improbable. They are not unlikely to have been filled in with earth to increase their power of resistance when the castle was battered from the churchyard. The eastern turret contains a square well-staircase of fifty-four steps, which leads to the battlements, and has a mural chamber on its way. The entrance below to this staircase is by an original full-centred arch, partially blocked up. This tower is somewhat higher than the curtain, with which it does not communicate. It is said to have been originally higher by a few feet more. Even at present it is the highest part of the castle, and hence the family banner is displayed. Below and outside this tower, to the north, are some modern offices. Between Thorpe Tower and the Well Tower is seen in the wall the outline of a recess for a loop, and above it a segmental arch and Norman moulding, now closed up. The whole south side of the keep area is occupied by a block of building, about 80 feet long by from 20 feet to 30 feet deep. No doubt part of this building may be original, but by far the more prominent part is evidently modern, and sadly out of place. It covers the rear of the two southern half-round towers, which are thus not seen from within.