Domesday Book
The Domesday book gave the names of King William's friends and even listed the number of pigs on a piece of land. But it was not like a modern census. It did not give the names of all the people. It listed the heads of each household, but left out Londoners, monks, nuns, and anyone living in castles. In effect, it listed only people he could get rent from, and who might supply men to fight in his army.