http://en.wikipedia.org/wiki/Roger_of_Montgomery,_1st_Earl_of_Shrewsbury

Roger de Montgomerie, known as Roger the Great de Montgomery, was the first Earl of Shrewsbury. His father was also Roger de Montgomerie, and was a relative, probably a grandnephew, of the Duchess Gunnor, wife of Duke Richard I of Normandy. The elder Roger had large holdings in central Normandy, chiefly in the valley of the Dives, which the younger Roger inherited.
Roger was one of William the Conqueror's principal counselors. He did not fight in the initial invasion of England in 1066, instead staying behind to help govern Normandy. Afterwards he was entrusted with land in two places critical for the defense of England, receiving the rape of Arundel at the end of 1067 , and in November 1071 he was created Earl of Shrewsbury.
Roger was thus one of the half a dozen greatest magnates in England during William the Conqueror's reign. In addition to the large part of Sussex included in the Rape of Arundel, and seven-eights of Shropshire which were associated with the earldom of Shrewsbury, he had estates in Surrey, Hampshire, Wiltshire, Middlesex, Hertfordshire, Gloucestershire, Worcestershire, Cambridgeshire, Warwickshire and Staffordshire.
After William I's death in 1087, Roger had joined with other rebels to overthrow the newly crowned King William Rufus in the Rebellion of 1088. However William Rufus was able to convince Roger to abandon the rebellion and side with him, which was fortuitous as the rebels were beaten and lost their land holdings in England.
Roger first married Mabel of Bellême, who was heiress to a large territory on both sides of the border between Normandy and Maine. By her he had 10 children: