William the Conqueror established a feudal system of governance after the Battle of Hastings in 1066. This system divided land into estates managed by lords who pledged loyalty to the king in return for protection and rights. The implementation of feudalism allowed William to consolidate power and efficiently manage the vast territories he had conquered in England. It also facilitated the integration of Norman culture with Anglo-Saxon traditions, influencing the legal and social structures of medieval England. The Domesday Book, commissioned by William, further solidified feudal authority, providing a comprehensive record of landholdings and resources in the kingdom.