Final answer:
William the Conqueror introduced the feudal system, the Domesday Book for taxation and governance, and Norman architecture in royal dwellings and churches after his invasion of England in 1066.
Step-by-step explanation:
William the Conqueror's Introduction to England
William the Conqueror introduced significant changes to England after his successful invasion in 1066. Prior to his arrival, England was an Anglo-Saxon kingdom frequently subjected to Viking raids and was comprised of separate kingdoms such as Wessex, Mercia, and East Anglia. William, Duke of Normandy, claimed that Harold Godwinson had pledged fealty to him, which lent a pretext for his invasion, leading to the Battle of Hastings and the establishment of Norman rule.
Among the changes William the Conqueror introduced, the most notable was the feudal system, which restructured the English social and land tenure systems. He also commissioned the Domesday Book, an extensive inventory of landholdings and resources, used to manage feudal taxation and governance. Another major shift was the construction of royal dwellings and churches, such as Durham Cathedral, which reflected the Norman architectural style and represented the new order imposed across the nation.
These actions altered the course of English history, consolidating the power of the monarchy, and marking the transition from Anglo-Saxon to Norman culture and law. The impact of William's conquest and the adoption of Normandy's feudal structure became stepping stones for future developments in English governance and society.