CAMBRIDGE.--Ordericus tells us that William built this castle on his return from his first visit to Yorkshire in 1068,[317] and Domesday Book states that twenty-seven houses were destroyed to make room for the castle.[318] There can hardly be a clearer statement that the castle was entirely new. We have already seen that there is some probability that Cambridge was first fortified by the Danes; for though it has been assumed to be a Roman castrum, no Roman remains have ever been found there, and the names which suggest Roman occupation, Chesterton and Grantchester, are at some distance from Cambridge. The castle, according to Mr St John Hope's plan,[319] was placed inside this enclosure, and the destruction of the houses to make room for it is thus explained. The motte and a portion of the bank of the bailey are all that now remain of the castle, but the valuable ancient maps republished by Mr Hope show that the motte had its own ditch, and that the bailey was rectangular. There was formerly a round tower on the motte, which, if it had the cross-loop-holes and machicolations represented in the print published in 1575, was certainly not of Norman date. The area of the bailey was 4-1/4 acres.[320] The castle was a royal one, and like many royal castles, went early to ruin. Henry IV. gave the materials of the hall to the master and wardens of King's Hall for building their chapel. The value of Cambridge T. R. W. is not given in Domesday Book. CANTERBURY.--Domesday Book only mentions this castle incidentally in connection with an exchange of land: "The archbishop has seven houses and the abbot of St Augustine fourteen for the exchange of the castle."[321] It has been too hastily assumed that it was a pre-Conquest castle which was thus exchanged for twenty-one houses; but anyone who knows the kind of relations which existed chronically between the archbishop of Canterbury and the abbot of St Augustine's will perceive that it was an impossibility that these two potentates should have held a castle in common. It was the land for the castle, not the castle itself, which the king got from these ecclesiastics. This is rendered clear by a passage in the Chartulary of St Augustine's, which tells us that the king, who was mesne lord of the city of Canterbury, had lost the rent of thirty-two houses through the exchange of the castle: seven having gone to the archbishop, fourteen to the abbot, and eleven having been destroyed in making the ditch of the castle.[322] There can scarcely be any doubt that the hillock now known by the ridiculous name of Dane John is the motte of this original castle of the Conqueror. Its proper name, the Dungeon Hill, which it bore till the 16th and even the 18th century,[323] shows what its origin was; it was the hill on which stood the dungeon or donjon of a Norman castle.[324] The name Dane John is not so much a corruption as a deliberate perversion introduced by the antiquary Somner about