Constitutional monarchy Act 1689, which placed similar limits on the Scottish monarchy. Although Queen Anne was the last monarch to veto an Act of Parliament when, on 11 March, 1708, she blocked the Scottish Militia Bill, Hanoverian monarchs continued to selectively dictate government policies. For instance King George III constantly blocked Catholic Emancipation, eventually precipitating the resignation of William Pitt the Younger as prime minister in 1801. The sovereign's influence on the choice of prime minister gradually declined over this period, King William IV being the last monarch to dismiss a prime minister, when in 1834 he removed Lord Melbourne as a
Veto both consuls. If one disagreed, either could invoke the "intercessio" to block the action of the other. The veto was an essential component of the Roman conception of power being wielded not only to manage state affairs but to moderate and restrict the power of the state's high officials and institutions. In Westminster systems and most constitutional monarchies, the power to veto legislation by withholding the Royal Assent is a rarely used reserve power of the monarch. In practice, the Crown follows the convention of exercising its prerogative on the advice of its chief advisor, the prime minister. Since the