Roger was one of William the Conqueror's principal counsellors, playing a major role in the Council of Lillebonne. He may not have fought in the initial invasion of England in 1066, instead staying behind to help govern Normandy. According to Wace's Roman de Rou, however, he commanded the Norman right flank at Hastings, returning to Normandy with King William in 1067. Afterwards he was entrusted with land in two places critical for the defence of England, receiving the Rape of Arundel at the end of 1067, and in November 1071 he was created Earl of Shrewsbury; a few historians believe that while he received the Shropshire territories in 1071 he was not created Earl until a few years later. In 1083, he founded Shrewsbury Abbey. Roger was thus one of the half dozen greatest magnates in England during William the Conqueror's reign. William gave Earl Roger nearly all of what is now the county of West Sussex, which at the time of the Domesday Survey was the Rape of Arundel. The Rape of Arundel was eventually split into two rapes, one continuing with the name Rape of Arundel and the other became the Rape of Chichester. Besides the 83 manors in Sussex, his possessions also included seven-eighths of Shropshire which was associated with the earldom of Shrewsbury, he had estates in Surrey, Hampshire, Wiltshire, Middlesex, Gloucestershire, Worcestershire, Cambridgeshire, Warwickshire, and Staffordshire. The income from Roger's estates would amount to about £2,000 per year, in 1086 the landed wealth for England was around £72,000, so it would have represented almost 3% of the nation's GDP. After William I's death in 1087, Roger joined with other rebels to overthrow the newly crowned king, William II, in the Rebellion of 1088. However, William was able to convince Roger to abandon the rebellion and side with him. This worked out favourably for Roger, as the rebels were beaten and lost their land holdings in England.
Family
Roger married Mabel de Bellême, who was heiress to a large territory straddling the border between Normandy and Maine. The medieval chronicler Orderic Vitalis paints a picture of Mabel of Bellême being a scheming and cruel woman. She was murdered by Hugh Bunel and his brothers who, possibly in December 1077, rode into her castle of Bures-sur-Dive and cut off her head as she lay in bed. Their motive for the murder was that Mabel had deprived them of their paternal inheritance. Roger and Mabel had 10 children:
Mabel of Montgomery, she married Hugh de Châteauneuf.
Roger of Montgomery, died young.
Roger then married Adelaide du Puiset, by whom he had one son, Everard, who entered the Church. After his death, Roger's estates were divided. The eldest surviving son, Robert of Bellême, received the bulk of the Norman estates ; the next son, Hugh, received the bulk of the English estates and the Earldom of Shrewsbury. After Hugh's death the elder son Robert inherited the earldom.
