Tribune

The Roman office of "Tribunes of the People" was established in 494 B.C., about 15 years after the foundation of the [Roman Republic] in 509. The plebeians of Rome seceeded as a group - left the city entirely - until the patricians agreed to the establishment of an office that would be sacrosanct and have the power to veto (Latin, "I reject") the action of any magistrate. The plebeians swore that they would kill anyone who harmed a tribune during his term of office. In about 450 the number of tribunes was raised to 10.

Tribunes were required to be plebeians, and until 421 was the only office open to them. In the late Republic the patrician politician Clodius arranged for his adoption by a plebeian branch of his family, and successfully ran for the tribunate.

By extension from the technical Roman governmental usage, some modern politicians have been identified as "Tribunes of the People." {{the various Frenchmen who were proud of this title in the 19th century are escaping me!}}.