<P> Tribunus plebis, rendered in English as tribune of the plebs, tribune of the people, or plebeian tribune, was the first office of the Roman state that was open to the plebeians, and throughout the history of the Republic, the most important check on the power of the Roman Senate and magistrates . These tribunes had the power to convene and preside over the Concilium Plebis, or people's assembly; to summon the senate; to propose legislation; and to intervene on behalf of plebeians in legal matters; but the most significant power of these tribunes was the power to veto the actions of the consuls and other magistrates, thus protecting the interests of the plebeians as a class . The tribunes of the plebs were sacrosanct, meaning that any assault on their person was prohibited by law . In imperial times, the powers of the tribunate were granted to the emperor as a matter of course, and the office itself lost its independence and most of its functions . During the day the tribunes used to sit on the tribune benches on the Forum Romanum . </P> <P> Fifteen years after the expulsion of the kings and establishment of the Roman Republic, the plebeians were burdened by the weight of crushing debt . A series of clashes between the people and the ruling patricians in 495 and 494 BC brought the plebeians to the brink of revolt, and there was talk of assassinating the consuls . Instead, on the advice of Lucius Sicinius Vellutus, the plebeians seceded en masse to the Mons Sacer (the Sacred Mount), a hill outside of Rome . </P>

What powers did a tribune allow the plebeians to exercise