Exchequer• But Chancery and Exchequer records provide corroboration.• He had his own exchequer at Marlborough for this purpose, and accounted at the Westminster Exchequer for transactions there.• But the ExchequerLevy increased by £2million to £8.9million.• When he was Chancellor of the Exchequer he started the orginal debtinitiatives.• None the less the king did summon the officers of the Exchequer to join him in Oxford.• The main purpose of the Exchequer was to prevent the Crown from being defrauded by its own officials.• It has been estimated that a tax on books and periodicals might add as much as £250m to the Exchequer.