During the Roman Republic, moneyers were called tresviri aere argento auro flando feriundo, literally "three men for casting (and) striking bronze, silver (and) gold (coins)".
[2] It was thought by Niebuhr[3] that they were introduced at the time when the Romans first began to coin silver, in 269 BC, but modern authors consider this too precise a reading of Pomponius.
They were not simple mint workers (monetarii), they were officials who controlled the process, including the design on the coins themselves.
Some of these special issues do not bear the signature of a triumvir monetalis, but the inscription CVR.
In any case, the magistrate's control of the legend on the coinage lent itself to the production of coins often containing propagandistic political messaging.