Roman currency comprised gold, silver, bronze, orichalcum, and copper coins. From its introduction to the Roman Republic, during the 3rd century B.C., well into Imperial times, Roman currency saw numerous changes in form, denomination, and composition. A persistent trait was the inflationary debasement and replacement of coins over the times. Well-known examples of this followed the reformations of Diocletian.
Distribution of Roman coins and hoards dating before 250 AD found in northern Europe
Where Roman coins have been found in Britain
Because of the economic power and longevity of the Roman state, the Roman coins were broadly used everywhere western Eurasia and northern Africa from ancient times into the Middle Ages. Roman currency names persist now in many nations (ex. the British pound, Mexican peso).