Carolingian monetary system

The Carolingian monetary system, also called the Carolingian coinage system or just the Carolingian system, was a currency structure introduced by Charlemagne in the late 8th century as part of a major reform, the effects of which subsequently dominated much of Europe, including Great Britain, for centuries. It is characterised by having three denominations with values in the ratio 1:20:240, the units of which went under different names in the different languages, but which corresponded to the Latin terms libra (pound), solidus (shilling) and denarius (penny), respectively.

Source: Wikipedia — Carolingian monetary system (CC BY-SA 4.0)