asRoman unit of weight and coin
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Aspects of this topic are discussed in the following places at Britannica.
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coinage
( in coin: The beginnings )
...aes signatum bars were halfway between aes rude and true coinage. In 269 true coinage appeared. It consisted of aes grave, large circular cast coins of bronze all bearing marks of value, from the as (weighing one pound) down to its 12th, the uncia; the obverses showed the head of a deity, the reverses a ship’s prow. These were paralleled at mints elsewhere by similar cast coins; their types...
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measurement systems
( in measurement system: Greeks and Romans )
Prior to the 3rd century bc the standard for all Roman weights was the as, or Old Etruscan or Oscan pound, of 4,210 grains (272.81 grams). It was divided into 12 ounces of 351 grains (22.73 grams) each. In 268 bc a new standard was created when a silver denarius was struck to a weight of 70.5 grains (4.57 grams). Six of these...
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