Yet in spite of this limited role Parliament had, over the preceding centuries, acquired vast "de facto" powers, most notably the power the raise tax revenues far in excess of all other sources of revenue at the Crown's disposal.
Yet in spite of this limited role Parliament had, over the preceding centuries, acquired "de facto" powers that were of enough significance that monarchs could not simply ignore them indefinitely. Without question, for a monarch Parliament's most indispensable power was its ability to raise tax revenues far in excess of all other sources of revenue at the Crown's disposal.