Norman Conquest Encyclopedia
Chester
William I built a castle at Chester as part of his final campaign in the north of England. A man called Gherbaud was left behind as Earl of Chester, but he soon returned to his home in Flanders and Hugh d'Avranches, called Hugh-le-Loup, became the Earl. He lived up to his nickname of Wolf in his campaigns against the Welsh and was the builder of Rhuddlan Castle.
The castle at Chester would have been similar to this typical motte and bailey castle, based on Rhuddlan.