Answer:
King William Normandy reign.
Explanation:
King William gave Norman knights parcels of land and all nobles had to swear an oath of loyalty to him.
Normans marriage with Anglo-Saxon nobility implied merging of Anglo-Saxon and French into a new English language. The king took the first census in Europe (since roman times), called the Domesday Books. It was a comprehensive census, including - people, manors, and farm animals. The king also further developed the system of taxation and royal courts.
His all these contributions made him have significant impact & imprint on England monarchy.
