Pound sterling

H ISTORY
The pound sterling is the world's oldest currency still in use.
Anglo-Saxon
Main article: Anglo-Saxon pound
A pound = 20 shillings = 240 silver pennies (formerly)
The pound was a unit of account in Anglo-Saxon England, equal to 240 silver pennies and equivalent to one pound weight of silver. It evolved into the modern British currency, the pound sterling.
The accounting system of 4 farthings = 1 penny, 12 pence = 1 shilling, 20 shillings = 1 pound was adopted from that introduced byCharlemagne to the Frankish Empire (see French livre).
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 12d. 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 weighed 5,400 troy grains, equivalent to 7,680 tower grains, about 350g). At this time, the name sterling had yet to be acquired. The penny swiftly spread throughout the other Anglo-Saxon kingdoms and became the standard coin of what was to become England.
Medieval
The early pennies were struck from fine silver (as pure as was available). However, in 1158, a new coinage was introduced by King Henry II (known as the Tealby penny) which was struck from 0.925 (92.5%) silver. This became the standard until the 20th century and is today known as sterling silver, named after its association with the currency. Sterling silver is harder than the 0.999 (99.9%) fine silver that was traditionally used and so sterling silver coins did not wear down as rapidly as fine silver coins. The English currency was almost exclusively silver until 1344, when the gold noble was successfully introduced into circulation. However, silver remained the legal basis for sterling until 1816. In the reign ofHenry IV (1399–1413), the penny was reduced in weight to 15 grains (0.97 g) of silver, with a further reduction to 12 grains (0.78 g) in 1464.
Tudor
During the reigns of Henry VIII and Edward VI, the silver coinage was drastically debased, although the pound was redefined to the troy pound of 5,760 grains (373 g) in 1526. In 1544, a silver coinage was issued containing just one third silver and two thirds copper—equating to .333 silver, or 33.3% pure. The result was a coin copper in appearance, but relatively pale in colour. In 1552, a new silver coinage was introduced, struck in sterling silver. However, the penny's weight was reduced to 8 grains (0.52 g), meaning that 1 troy pound of sterling silver produced 60 shillings of coins. This silver standard was known as the "60-shilling standard" and lasted until 1601 when a "62-shilling standard" was introduced, reducing the penny's weight to 7 23⁄31 grains (0.50 g).
Throughout this period, the size and value of the gold coinage fluctuated considerably.