A tribus, or tribe, was a division of the Roman people for military, censorial, and voting purposes. When constituted in the comitia tributa, the tribes were the voting units of a legislative assembly
A Roman denarius of 63 BC: a voter casting a ballot
Inscription (CIL 13.1029) from Gallia Narbonensis, recording the enrollment of Gaius Otacilius in the tribus Voltinia (abbreviated VOL), into which Gallic citizens were frequently placed.