What notable event did William the Conqueror achieve in 1066?

William the Conqueror is most famously known for successfully invading England in 1066 during the Battle of Hastings. This invasion was pivotal as it resulted in the Norman conquest of England, leading to dramatic changes in English society, governance, and culture. Following his victory, William established Norman rule over England, which significantly influenced the country's language, architecture, and legal systems for generations.

The implications of this event were profound; William implemented feudalism and redistributed land to his loyal followers, which reshaped the social structure of the nation. His conquest also led to the compilation of the Domesday Book, a great survey of England's lands and resources, demonstrating the newfound control he exerted over the kingdom.

While defending France from Viking incursions, forming the English Parliament, and signing the Magna Carta were significant events in their own right, they occurred in different contexts and times, and none relate directly to William's achievement in 1066. The successful invasion of England stands out as a transformative event that marked the beginning of a new era in English history.