The insertion of the window in question probably had the effect of weakening the walls of the chapel; at any rate they show signs of a tendency to settle. Beneath it is the tomb of Archbishop Bradwardine, a great scholar and divine, whose primacy only lasted three months. Opposite to him lies Simon de Mepeham--archbishop from 1328 to 1333--whose tomb forms the screen of the chapel. It is a black marble monument well worthy of examination, with a double arcade and a richly decorated canopy; the ornamentation has been greatly damaged, but the shattered remains show traces of beautiful work. Mepeham's short primacy was brought to an untimely end by the contumacy of Grandisson, Bishop of Exeter, who refused to allow him to enter Exeter Cathedral, actually guarding the west door with an armed force. The pope sided with the recalcitrant bishop, and Mepeham died, according to Fuller, of a broken heart in consequence of this humiliation. #The Watching Chamber.#--Above the Chapel of St. Anselm is a small room, which is reached by a staircase from the north-west corner. A window in it commands a view into the cathedral, and from this circumstance it has been inferred that a watcher was stationed here at night to protect the priceless treasures of St. Thomas's shrine from pillage by marauders. Some doubt has been thrown on this assumption, since the site of the shrine is not fully seen from the window, but the room is still generally known as the Watching Chamber. Probably the shrine was much more efficiently guarded than by the presence of a solitary monk in a chamber, from which even if he could see thieves he certainly could not arrest them; for we know that "on the occasion of fires the shrine was additionally guarded by a troop of fierce ban-dogs" (Stanley). It is also said that King John of France was imprisoned in this chamber during his stay at Canterbury, but this is most unlikely, seeing that he was treated by the Black Prince more as a sovereign than as a captive. [Illustration: SOME MOSAICS FROM THE FLOOR OF TRINITY CHAPEL.]