Answer :

It helped him assess the extent of the land and resources being owned in England at the time, and the extent of the taxes he could raise. 



The Domesday Book is one of Medieval England's greatest treasures. The Domesday Book is closely linked with William the Conqueror's attempt to dominate Medieval England. Along with a string of castles throughout England, the Domesday Book was to give William huge authority in England.

To further extend his grip on England, William I ordered that a book be made containing information on who owned what throughout the country. This book would also tell him who owed him what in tax and because the information was on record, nobody could dispute or argue against a tax demand. This is why the book brought doom and gloom to the people of England - hence "Domesday Book". The decision of what someone owed was final - rather like Judgement Day when your soul was judged for Heaven or Hell.

William ordered the survey of England to take place about twenty years after the Battle of Hastings. The Saxon Chronicle states that it took place in 1085, while other sources state that it was done in 1086. The whole survey took less than a year to complete and the books can be found in the Public Records Office.

The Domesday Book forms a remarkable record of the state of England in the mid-1080's. A sample of the questions asked is found at Ely Cathedral;

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