The Norman Conquest of England occurred in 1066 when William the Conqueror, the Duke of Normandy, invaded England. This event was triggered by the death of King Edward the Confessor, which led to a power struggle. William claimed the English throne, asserting that Edward had promised it to him. After defeating King Harold II at the Battle of Hastings, William became the new king. The conquest significantly changed England's culture, language, and governance. The Normans introduced feudalism, reshaping land ownership and social structure. Additionally, the Domesday Book was created to assess land and resources, marking a pivotal moment in English history.