Fun fact!

The £/s/d system comes from Charlemagne in the 8th century to unify currency in his Frankish empire, not Roman times! A Carolingian pound of pure silver (libra/pfund, about 408g) was divided in 20 shillings (solidus/schilling), themselves divided into 12 pennies (denarius/pfenning). Only pfennings were actually minted, the other two were accounting units.