In the opening passage of the Breviarium of Festus we read the following: ‘… ac morem secutus calculonum, qui ingentes summas aeris breuioribus exprimunt, res gestas signabo, non eloquar. Accipe ergo quod breuiter dictis breuis conputetur …’ The problem that I should like briefly to discuss in the following study is: Who were the calculones, ‘qui ingentes surnmas aeris breuioribus exprimunt’? This term calculo, and indeed the whole problematic clause can, I suggest, only be fully understood and appreciated in the (...) light of monetary developments of the later fourth century. (shrink)