The rebellion of 1118 gave to Henry the castles of Hugh de Gournay in the west, of Stephen of Albemarle at Scarborough, of Eustace of Breteuil, of Richard de l’Aigle, and of Henry Earl of Eu; together with the Mowbray castles of Thirsk, Malzeard, and Burton in Lonsdale. Nearly the whole of the strongholds thus acquired were retained by Henry in his own hands, and Suger states that in Normandy the principal castles were by him either destroyed or held: “Fere omnes turres et quæcunque fortissima castra Normanniæ ... aut eversum iri fecit ... aut si dirutæ essent propriæ voluntati subjugavit.” In either country he laid hands on the castles; but where the delinquents held in both, it was upon those in England that the forfeiture was most rigidly enforced. Among the exceptions were William de Roumare, who was allowed to hold Lincoln; and similar protection was shown to Ralph de Conches, William de Tancarville, William de Warenne, Walter Giffard, and William d’Albini. Among their castles were Ryegate, Lewes, Coningsburgh, and Castle Rising, Buckingham and Arundel. It has been said that Henry did not himself construct any new castles. This is probable enough, as all the sites of importance had been occupied by his father; but it is not improbable, judging from the internal evidence afforded by their remains, that he completed such of his father’s castles as were left unfinished. Of baronial castles, the grand fortress of Kenilworth, by far the most important strong place in the midland counties, was constructed in this reign, though very probably upon an English site, by the founder of the house of Clinton. In this reign also were probably constructed the masonry of Northampton Castle, by Simon de St. Liz, and that of Old Sarum and Odiham by Bishop Roger. The keep of St. Briavel’s, now destroyed, was reconstructed, or built of masonry; and Ralph Flambard laid the foundations of and seems to have completed the keep of Norham.