as
Quick Summary
The as was a basic unit of weight and currency in ancient Rome. Initially, it was a bronze unit weighing about 272.81 grams. This weight was divided into 12 ounces.1
Over time, the as underwent significant changes. By the 3rd century BCE, a new standard was established with the introduction of the silver denarius. The as continued to be used, but its weight and value fluctuated, especially as it became a token currency. By 89 BCE, the as had dropped to about one-twelfth of its original weight.12
The aureus was the basic gold monetary unit in ancient Rome, initially equivalent to 25 silver denarii. Later, in 312 CE, the aureus was replaced by the solidus as the primary monetary unit.3
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