As

Also called an aes.

A copper Roman coin (as singular, asses plural). These are slightly larger than the dupondii. On asses the Emperor's head is shown wearing a laurel wreath. Two asses were worth the same as one dupondii.

A Roman as coin from the site of a Roman temple in Caister St Edmund.

The obverse of a Roman as coin from the site of a Roman temple in Caistor St Edmund. NWHCM 1929.152.11:A

 (© NCC)