From Longman Dictionary of Contemporary Englishtribunetrib‧une /ˈtrɪbjuːn/ noun [countable] PGOan official in ancient Rome who was elected by the ordinary people to protect their rights
Examples from the Corpus
tribune• Judges are not the first species that springs to mind as a faithful tribune of popular perception.Origin tribune (1300-1400) Latin tribunus, from tribus; → TRIBE 