Denarius
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The denarius was a small silver coin. It was made by the Roman Empire and Roman Republic a long time ago. The denarius weighed about 3 to 4.5 grams. It was the main coin of Ancient Rome. During the Empire the front side usually had a picture of the emperor on it.

row 1 : 157 BC Roman Republic, 73 AD Vespasian, 161 AD Marcus Aurelius, 194 AD Septimius Severus;
row 2: 199 AD Caracalla, 200 AD Julia Domna, 219 AD Elagabalus, 236 AD Maximinus Thrax.
row 2: 199 AD Caracalla, 200 AD Julia Domna, 219 AD Elagabalus, 236 AD Maximinus Thrax.
See also: Roman coins.