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! Year !! Event !! Weight !! Purity !! Note<ref name=Harl>{{cite book|author=Kenneth W. Harl|title=Coinage in the Roman Economy, 300 B.C. to A.D. 700|url=https://books.google.com/books?id=5yPDL0EykeAC&pg=PA94|date=12 July 1996|publisher=JHU Press|isbn=978-0-8018-5291-6|pages=94–5|access-date=9 June 2019|archive-date=4 September 2023|archive-url=https://web.archive.org/web/20230904145057/https://books.google.com/books?id=5yPDL0EykeAC&pg=PA94|url-status=live}}.</ref>
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| 267 BC || Predecessor || 6.81 g || ? || {{frac|1|48}} pound. Equals 10 ''asses'', giving the ''denarius'' its name, which translates as "containing ten". The original copper coinage was weight-based, and was related to the Roman pound, the ''libra'', which was about 325 g. The basic copper coin, the ''as'', was to weigh 1 Roman pound. This was a large cast coin, and subdivisions of the ''as'' were used. The "pound" (''libra'', etc.) continued to be used as a currency unit, and survives e.g. in the British monetary system, which still uses the pound, abbreviated as £.
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| 211 BC || Introduction || 4.55 g || 95–98% || {{frac|1|72}} pound. ''Denarius'' first struck. According to Pliny, it was established that the ''denarius'' should be given in exchange for ten pounds of bronze, the ''quinarius'' for five pounds, and the ''sestertius'' for two-and-a-half. But when the ''as'' was reduced in weight to one ounce, the ''denarius'' became equivalent to 16 ''asses'', the ''quinarius'' to eight, and the ''sestertius'' to four; although they retained their original names. It also appears, from Pliny and other writers, that the ancient ''libra'' was equivalent to 84 ''denarii''.
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