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 was, 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 ; to summon the senate; to propose legislation; and to intervene on behalf of plebeians in legal matters; but the most significant power was 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 typically found seated on special benches set up for them in the Roman Forum. The tribunes were sacrosanct, meaning that any assault on their person was punishable by death. 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.

The Roman Republic was the era of classical Roman civilization beginning with the overthrow of the Roman Kingdom and ending in 27 BC with the establishment of the Roman Empire. During this period, Rome's control expanded from the city's immediate surroundings to hegemony over the entire Mediterranean world.