One of William’s most noteworthy acts was the commissioning of the Domesday Survey on December 25, 1086 that catalogued England’s population. Primarily, the survey was carried out so as to record accountability to the land tax. The results of the survey were recapitulated in the 2 great volumes called the Domesday Book. Six months after this, William demanded for pledges of fealty from vast landowners regardless of whether they were tenants-in-chief or not. This way, he was affirming his rights not just as a feudal aristocrat over vassals, but as a king over his subjects.