THE TOWER OF LONDON.--Here, as at Colchester, there is no motte, because the original design was that there should be a stone keep. Ordericus tells us that after the submission of London to William the Conqueror he stayed for a few days in Barking while certain fortifications in the city were being finished, to curb the excitability of the huge and fierce population.[710] What these fortifications were we shall never know, but we may imagine they were earthworks of the usual Norman kind.[711] Certainly the great keep familiarly known as the White Tower was not built in a few days; it does not appear to have been even begun till some eleven years later, when Gundulf, a monk celebrated for his architectural skill, was appointed to the see of Rochester. Gundulf was the architect of the Tower,[712] and it must therefore have been built during his episcopate, which lasted from 1077-1108.[713] In 1097 we read that "many shires which owe works to London were greatly oppressed in making the wall (weall) round the Tower."[714] This does not necessarily mean a stone wall, but probably it does, as Gundulf's tower can hardly have been without a bank and palisade to its bailey. As the Tower in its general plan represents the type of keep which was the model for all succeeding stone keeps up to the end of the 12th century, it seems appropriate here to give some description of its main features. Its resemblance to the keep of Colchester, which also was a work of William I.'s reign, is very striking.[715] Colchester is the larger of the two, but the Tower exceeds in size all other English keeps, measuring 118 × 98 feet at its base.[716] As it has been altered or added to in every century, its details are peculiarly difficult to trace, especially as the ordinary visitor is not allowed to make a thorough examination.[717] Thus much, however, is certain: neither of the two present entrances on the ground floor is original; the first entrance was on the first floor, some 25 feet above the ground, at the S.W. angle of the south side, and has been transformed into a window. There was no entrance to the basement, but it was only reached by the grand staircase, which is enclosed in a round turret at the N.E. angle. There were two other stairs at the N.W. and S.W. angles, but these only began on the first floor. The basement is divided by a cross wall, which is carried up to the third storey. There are at present three storeys above the basement. The basement, which is now vaulted in brick, was not originally vaulted at all, except the south-eastern chamber, under the crypt of the chapel.