Orichalcum
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Orichalcum or orichalc is a metal mentioned in several ancient writings, including the story of Atlantis in the Critias of Plato. Within the dialogue, Critias says that orichalcum had been considered
Orichalcum found in Gela, Sicily
An orichalcum sestertius issued under Nero, perhaps depicting the equestrian Troy Game, a kind of cavalry parade (decursio)
Sestertius
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The sestertius or sesterce was an ancient Roman coin. During the Roman Republic it was a small silver coin issued only on rare occasions. During the Roman Empire it was a large brass coin.
Sestertius of Hadrian, dupondius of Antoninus Pius, and as of Marcus Aurelius
Example of a detailed portrait of Hadrian AD 117–138
Hostilian AD 251
A sestertius of Nero, struck at Rome in AD 64. The reverse shows the emperor on horseback with a companion. The legend reads DECVRSIO, "a military exercise". Diameter 35 mm