* To establish his authority and control: The Norman Conquest of 1066 was a relatively recent event, and William needed to assert his power and consolidate his hold on England. The Domesday Book provided a detailed inventory of the land and resources of the country, allowing him to determine who owned what, and therefore who owed him taxes and military service.
* To assess the financial and military potential of the country: The book provided valuable information about the size and value of landholdings, the number of people living in each area, and the potential for taxation and military recruitment. This information was crucial for William in planning his administration and defense.
* To standardize taxation and justice: Before the Norman Conquest, land ownership and taxation were often uneven and inconsistent. The Domesday Book helped to establish a more centralized and equitable system of taxation, and provided a basis for resolving disputes over land ownership.
* To create a lasting record of the country: The Domesday Book was a massive undertaking, and William intended it to be a permanent record of the state of England at the time of his conquest. It provides an invaluable source of information for historians today, offering insights into the social, economic, and political life of 11th century England.
In short, the Domesday Book was a powerful tool for William the Conqueror to consolidate his power, manage his kingdom, and secure its future. It is a testament to his ambition and his desire to leave a lasting legacy.