In 1085 William the Conqueror’s England was under threat of invasion by the Danes. In order to find out the financial and military resources available to him, he ordered that a survey should be undertaken throughout England. The results of this great survey is known as The Domesday Book.
Copies of the survey are now available online at the UK’s National Archives. There is a searchable database for place and people’s names, and plenty of background information on how the survey was conducted, the questions asked, and what life was like in 11th century England. Images of the pages of the book require a small payment.