I know that after William the Conquerer won at Hastings he gave land and titles to a bunch of his Normans (Norman Lear, Norman Mailer,etc.), taking the land and titles from the old, defeated, Saxon nobility. Did any of the old Saxon nobles manage to hold onto their lands and titles under Norman rule, or were they all stripped?
From what I know, some of the Saxon nobility were able to keep their lands, and therefore titles, for a brief while after Hastings. However, after four years of rebellion, William I ordered all lands seized and given to his own nobles, introducing feudalism to England. Saxon noble houses either married into those of the conquerors, or they fled the country.
From History of England, by George Macaulay Trevelyan, 1927, pp.118-119.