Imperial Era Coinage
Following the coinage reform of Augustus in 23 BC, the as was struck in reddish pure copper (instead of bronze), and the sestertius or 'two-and-a-halfer' (originally 2.5 asses, but now four asses) and the dupondius (2 asses) were produced in a golden-colored alloy of bronze known by numismatists as orichalcum. The as continued to be produced until the 3rd century AD. It was the lowest valued coin regularly issued during the Roman Empire, with semis and quadrans being produced infrequently, and then not at all by the time of Marcus Aurelius. The last as seems to have been produced by Aurelian between 270 and 275 and at the beginning of the reign of Diocletian.
Read more about this topic: As (Roman Coin)
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