The middle chamber is that possessing most interest, from the number and quality of the memorials cut upon its walls by its distinguished prisoners. Its plan is rectangular, with a western bow of three sides of an octagon. In the gorge wall is a large modern restored window, and in the bow two loops and one central window, no doubt once a loop, towards the field. One face is occupied by a fireplace, perhaps of modern date. Though used as a prison, it was evidently constructed for defence only, as a _place d’armes_ upon the rampart. Hence the rampart walk is continued right through it, and from the passage opens a small mural chamber 6 feet by 8 feet, with a loop to the field, and near it a small mural garderobe, 5 feet by 4 feet. The staircase on the south, and these chambers on the north, occupy the two square turrets which flank the Beauchamp Tower. Beauchamp Tower is in the Decorated style, and the work of the fourteenth century, probably of Edward III. It is evidently later than the contiguous curtain into which it has been inserted. Its name of Beauchamp is probably derived from Thomas Earl of Warwick, who was imprisoned here towards the end of the fourteenth century, and it has also been called “Cobham,” from the well-known prisoner of that name, who was lodged here in consequence of Wyatt’s conspiracy. It is built of uncoursed rubble, much resembling St. Thomas’s and Salt Tower, and very different from the basements of Wakefield, Bell, and Martin towers. The rubble is broken into vertical compartments by lines of ashlar, or single stones, set like coign stones, though on a plain surface. The curtain from Beauchamp to Devereux Tower is 148 feet in length, and about 30 feet high outside, the rampart being level, and the ground rising. It is original, and about 10 feet thick, except where it expands to 14 feet on joining the Beauchamp Tower. The cells in its base are indicated by their exterior loops. Near to Devereux Tower this curtain has been altered and renewed, and a raised platform, covering the church vaults, and a brick chamber, annexed to the tower, have been built against it. Devereux Tower caps the north-west angle of the ward. In plan it is about three-quarters of an irregular circle, 35 feet across at the gorge, and of about 30 feet projection. It is of two stages; the lower 10 feet or 12 feet being solid. A well-stair at its junction with the north curtain leads downwards from the church platform to the basement, and to a vaulted garderobe, 7 feet 10 inches by 6 feet 7 inches with two exterior loops, and one towards the inner ward. This is in the curtain.