It is therefore an established fact that modern Cambridge has been successively British, Roman, Saxon, and Norman, and the original town, situated on the north-western side of the river, has extended across the water and filled the space bounded on three sides by the Cam.
Being on the edge of the Fen Country, where the Conqueror found the toughest opposition to his completed sovereignty in England, the patch of raised ground just outside modern Cambridge was a suitable spot for the erection of a castle, and from here he conducted his operations against the English, who held out under Hereward the Wake on the Isle of Ely. In the hurried operations preceding the taking of the “Camp of Refuge” in 1071, there was probably only sufficient time to strengthen the earthworks and to build stockades, but soon afterwards William erected a permanent castle of stone on this marsh frontier—a building Fuller describes as a “stately structure anciently the ornament of Cambridge.” In her scholarly work on the town, Miss Tuker tells us how Edward III. quarried the castle to build King’s Hall; how Henry VI. allowed more stone to be taken for King’s College Chapel; and how Mary in 1557 completed the wiping out of the Norman fortress by granting to Sir Robert Huddleston permission to carry away the remaining stone to build himself a house at Sawston! Wherever building materials are scarce such things have happened, even to the extent of utilizing the stones of stately ruins for road-making purposes. It thus comes about that the artificial mound and the earthworks on the north side of it are as bare and grass-grown as any pre-historic fort which has not at any period known a permanent edifice.
Owing to its fairs, and particularly to the famous Stourbridge Fair, an annual mart of very great if uncertain antiquity, held near the town during September, Cambridge at an early date became a centre of commerce, and it had risen to be a fairly large town of some importance before the Conquest. In the time of Ethelred a royal mint had been established there, and it appears to have recovered rapidly after its destruction by Robert Curthose in 1088, for it continued to be a mint under the Plantagenets, and even as late as Henry VI. money was coined in the town.