also use the veto to prevent a bill from being brought before the plebeian assembly. The consuls also had the power of veto, as decision-making generally required the assent of both consuls. If they 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. A notable use of the Roman veto occurred in the Gracchan land reform, which was initially spearheaded by the tribune Tiberius Gracchus in 133 BC. When Gracchus' fellow tribune Marcus Octavius vetoed the reform, the Assembly voted to remove him on the theory that a tribune must represent the interests of the plebeians. Later, senators outraged by the reform murdered Gracchus and several supporters, setting off a period of internal political violence in Rome. Liberum veto In the constitution of the Polish–Lithuanian Commonwealth in the 17th and 18th centuries, all bills had to pass the Sejm or "Seimas" (parliament) by unanimous consent, and if any legislator invoked the liberum veto, this not only vetoed that bill but also all previous legislation passed during the session, and dissolved the legislative session itself. The concept originated in the idea of "Polish democracy" as any Pole of noble extraction was considered as good as any other, no matter how low or high his material condition might be. The more and more frequent use of this veto power paralyzed the power of the legislature and, combined with a string of weak figurehead kings, led ultimately to the partitioning and the dissolution of the Polish state in the late 18th century. Emergence of modern vetoes The modern executive veto derives from the European institution of royal assent, in which the monarch's consent was required for bills to become law. This in turn had evolved from earlier royal systems in which laws were simply issued by the monarch, as was the case for example in England until the reign of Edward III in the 14th century. In England itself, the power of the monarch to deny royal assent was not used after 1708, but it was used extensively in the British colonies. The heavy use of this power was mentioned in the U.S. Declaration of Independence in 1776. Following the French Revolution in 1789, the