The Roman imperial money system
was based on the metal value of coins in , silver and bronze.
The coins were:
aureus (1/42 of a pound of
silver) equal to 25 denarii, 400 asses
denarius (1/84 of a pound of
silver) equal to 16 asses
sesterce (brass) equal to 4
dupondius (brass) equal to
(copper) The as was halved and quartered under Augustus.
Later emperors debased the coinage
and caused successive economic disturbances until Diocletian
reformed the system by introducing new standard weight aurei and
denari. New copper coins were also circulated but their
contemporary names are not known.