Even before the Norman Conquest, there was a strong tradition of landholding in Anglo-Saxon law. When William the Conqueror asserted sovereignty over England in 1066, he confiscated the property of the recalcitrant English landowners. Over the next dozen years, he granted land to his lords and to the dispossessed Englishmen, or affirmed their existing land holdings, in exchange for fealty and promises of military and other services. At the time of the Domesday Book, all land in England was held by someone, and from that time there has been no allodial land in England. In order to legitimise the notion of the Crown's paramount lordship, a legal fiction—that all land titles were held by the King's subjects as a result of a royal grant—was adopted.