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Roman Coin Denominations
Gold (Aureus) 25 denarii
Silver (Denarius) 6 asses
Silver (quinarius) 8 asses
Orichalchum (sestertius) 4 asses
Orichalchum (dupondius) 2 asses
Copper (as) 4 quadrantes
Orichalchum (semis) 2 quadrantes
Copper quadrans 1/4 as

In 294 under Diocletian, new denominations based on the Follis were used:

Gold Aureus 24 argentii
Silver Argentius 5 AE Follis
Bronze follis 5 antoninianus
Bronze antoninianus 2 denarii

During the middle of the 300’s, the coinage was in turmoil. We do not know what the Romans called their coins during this time so we now call the bronze coinage names based upon size:

AE1 Larger than 25mm diameter
AE2 from 21mm – 25mm diameter
AE3 from 17mm – 21mm diameter
AE4 under 17mm diameter