Why did William I order the Domesday survey in 1085?

In 1085, William I ordered a comprehensive survey of England, which became known as the Domesday Book. While historians have debated the specific motivations behind this massive administrative undertaking, it is widely considered a multipurpose document.1

The primary reasons for the survey included:

• Taxation: Many scholars view the survey as a tool for assessing national resources to improve the efficiency and accuracy of tax collection.1
• Feudal Administration: The survey served as a vital record for establishing and assigning feudal rights and duties among the king and his tenants in chief. By organizing the data under the names of these landholders, the survey reinforced the new Norman structure of society, which was based on the concept of the honour or barony.12

Although the project was met with significant popular resentment, it remains one of the most remarkable administrative achievements of the Middle Ages, providing a detailed account of land ownership, agricultural capacity, and economic value across the kingdom.21