To Galfrid Rufus may be attributed the present great north and south doorways of the nave, themselves, however, replacing earlier ones. The sculpturing upon these doorways, and that upon the corbels which once supported the ribs at the east end of the chapter-house, have apparently been done by the same hand, and there is otherwise much in common between the decoration of these doorways and that of the chapter-house itself. Skilfully wrought and probably contemporary ironwork covers the south door, still remaining in a very perfect state. On the north door there are sufficient indications to show what was the pattern of the ironwork once there, and, indeed, with care and under a favourable light, the very elaborate design may be made out. The grotesque but effective sanctuary knocker of bronze, of the same date as the door itself, if it does not invite the unfortunate offender to seek for that protection now, happily, under more humane conditions, not needed for his safety, will recall to memory how the Church in a ruder age held out her saving hand, and interposed between the shedder of blood, sometimes guiltless, and the avenger. The death of Bishop Carileph took place in 1096, and an interval of three years elapsed before the election of Bishop Flambard, in 1099, who is described as great by some, and infamous by other, writers. Ralph Flambard was William Rufus’s Chancellor, and whether he was infamous or not, he was, anyhow, a remarkable man. We are told by the continuator of Symeon, that he carried on the work of the nave up to the roof--that is, that he completed the nave as far as the vault, including the side aisles and their vaults, and probably at the same time building that portion of the western towers which attains an equal elevation with the walls of the nave. [Illustration: THE SANCTUARY KNOCKER, DURHAM CATHEDRAL.]