At the south-western corner of the King’s House is the Bell Tower, a passage leading into it from the first floor of that building. A bell which formerly hung in a wooden turret on this tower gave it its name—the turret still remains, but the bell is kept in the upper storey. In the Tower regulations of 1607 it is ordered that: “When the Tower bell doth ring at nights for the shutting in of the gates, all the prisoners, with their servants, are to withdraw themselves into their chambers, and not to goe forth that night.” This bell was also the alarm bell of the fortress. [Illustration: _Prison in the Governor’s House._] The Bell Tower, which dates from the time of Richard I. or Henry III., is an irregular octagon, being 60 feet in height and 30 in diameter. The lower portion is of solid masonry, the walls varying from 9 to 13 feet in thickness. There are only two floors or storeys in the Tower, the lower with a fine vaulted ceiling. The room in the upper storey is a circular chamber, 18 feet across, with walls 8 feet in thickness. This prison is reached by a narrow staircase from the King’s House, and is lighted by four windows. Bishop Fisher was imprisoned in the upper chamber in the reign of Henry VIII., Sir Thomas More being confined in the one below. Both were harshly treated, and the poor old bishop suffered terribly from the cold. In the lower chamber, where More passed many solitary hours, even debarred from the consolation of his books, there now stands a large model of the Tower. Near the door of the upper prison a much defaced inscription can be seen on the wall, cut by the Bishop of Ross, who was a prisoner here in the time of Elizabeth. Felton, the murderer of George Villiers, Duke of Buckingham, is also believed to have been a prisoner in the Bell Tower.