Since Pompeii was a Roman town, Roman coins of the first century AD were used: the Aureus, the Quinarius Aureus, the Denarius, the Quinarius Argenteus, the Sestertius, the Dupondius, the As, the Semis and the Quadrans.

Quintin, quintet, quintuplets, quintuple, quintessential, quinine, quince, quinalizarin, quiname, quinamine, quinapril, quinarii, quinarius, quinary, quinate, quinazol, quinazoline, quincentenary, quincentennial, quincewort, quinch, quincunial, quincunx, quincunxial...

The basic Roman coins that were used throughout the empire were the As, Dupondius,

Denarius,

Sestertius

and Aureus.

There were also vanity coins or coins of necessity such as the Antoninianus,

created by Caracalla or the gold Solidus created by Constantine. Some coins were more common in the republic but seem to have gone out of "style" during the principate.

An example of this is the Quinarius.

Other coins were discontinued such as the very small quadrans

which was discontinued by Marcus Aurelius.

The Roman currency system changed over time. The coins of the Roman republic were the denarius (gold) sestertius (silver) dupondius (brass) as (bronze, later copper) semis (bronze) triens (bronze) quadrans (bronze) quincunx (bronze) and uncia (bronze).

The emperor Augustus reformed the system in 27 BC. The coins were the aureus (gold) quinarius aureus denarius (silver) quinarius (silver) sestertius (silver) dupondius (brass) as (bronze, later copper) semis (bronze) and quadrans (bronze).

The emperor Diocletian reformed the system in 293 and 301. The coins were the solidus (gold) argenteus (silver) numnus (copper) radiate (probably 20 parts bronze to 1 part silver) laureate and denarius (silver).

Soon after the reign of Diocletian's the system was changed again by Constantine the Great. Only the solidus and the numnus were retained. Constantine introduced the miliarense (silver). The siliqua (silver) was introduced either by Constantine or Constantius II.