for administering the resources of each burhs' outlying estates. It was a separate ealdormanship briefly in the 10th century before forming part of the Earldom of Mercia in the 11th century. The last known Anglo-Saxon Sheriff of Worcestershire was Cyneweard of Laughern. Norman Conquest During the Middle Ages, much of the county's economy was based on the wool trade. Many areas of its dense forests, such as Feckenham Forest, Horewell Forest and Malvern Chase, were royal hunting grounds subject to forest law. After the Norman conquest of England; the Domesday Book noted in 1086 that in seven of the twelve hundreds covering Worcestershire, the Crown had no authority. The Crown's authority was replaced by the Bishop of Worcester and the Abbots at Pershore, Westminster and Evesham. William the Conqueror gave to his allies and friends manors and parishes captured from the Anglo-Saxons. Despite the Norman Conquest, the rest of the county was still held by the Abbeys of Pershore and Evesham, the Bishop of Worcester and Priory. The first Norman Sheriff Urse d'Abetot, built the castle of Worcester and seized much church land, some of which became part of the Crown's hundreds in Worcestershire. and was in dispute with the Bishop of Worcester over the rights of the sheriff. Bishop Wulfstan was the last Anglo-Saxon bishop in England, and remained in post until his death in 1095. Under his tenure Worcester Cathedral began major reconstruction, and he opposed political interventions against William and the Normans. He was later made a saint. High Medieval During Henry III's disputes and wars with his Barons, in 1263 Worcester's Jewish residents were attacked by a baronial force led by Robert Earl Ferrers and Henry de Montfort. Most were killed. The massacre in Worcester was part of a wider campaign by the De Montforts and their allies in the run-up to the Second Barons' War, aimed at undermining Henry III. Worcestershire was the site of the Battle of Evesham in which Simon de Montfort was killed on 4 August 1265. A few years later, in 1275, the Jews that were still living in Worcester were forced to move to Hereford, as they were expelled from all towns under the jurisdiction of the queen mother. Civil War In 1642, the Battle of Powick Bridge was the first major skirmish of the English Civil War. The county suffered from being on the Royalist front line, as it