Today we completed research in our history lesson. We wanted to find out what The Doomsday Book was and why it was so important. We found out that in 1085 William the Conquerer was concerned that England was under threat from a Viking invasion. To defend his land, he needed a large army. This would be expensive, so William needed to know who he could tax and how much people could afford to pay. To do this, he needed to survey the land and people of England. The Domesday Book also includes information about a small number of places in Wales, which were very close to the border with England. It doesn't include any information about Scottish landowners, as William did not control Scotland.