This gradual Normanization of the realm set the stage for the Norman Conquest, in which Emma's brother's grandson, William, Duke of Normandy, gained the kingdom in the first successful cross-Channel invasion since Roman times. Together with its new ruler, England acquired the foreign policy of the Norman dukes, which was based on protecting and expanding Norman interests at the expense of the French kings. Although William's rule over Normandy had initially had the backing of King Henry I of France, William's success had soon created hostility, and in 1054 and 1057 King Henry had twice attacked Normandy.