Pound sterling
History
The origins of sterling lie in the reign of King Offa of Mercia (757–796), who introduced the silver penny. It copied the denarius of the new currency system of Charlemagne's Frankish Empire. As in the Carolingian system, 240 pennies weighed 1 pound (corresponding to Charlemagne's libra), with the shilling corresponding to Charlemagne's solidus and equal to 12 pennies. At the time of the penny's introduction, it weighed 22.5 troy grains of fine silver (32 tower grains; about 1.5 g), indicating that the Mercian pound weighed 5,400 troy grains (the Mercian pound became the basis of the tower pound, which also weighed 5,400 troy grains, equivalent to 7,680 tower grains, about 350g).
Pound sterling-19