Pound sterling
Medieval, 1158

The early pennies were struck from fine silver (as pure as was available). In 1158, a new coinage was introduced by King Henry II (known as the Tealby penny), with a Tower Pound (5,400 grains, 349.9 g) of 92.5% silver minted into 240 pennies, each penny containing 20.82 grains (1.349 g) of fine silver. Called sterling silver, the alloy is harder than the 99.9% fine silver that was traditionally used, and sterling silver coins did not wear down as rapidly as fine silver ones.

The introduction of the larger French gros tournois coins in 1266, and their subsequent popularity, led to additional denominations in the form of groats worth four pence and half groats worth two pence. A gold penny weighing twice the silver penny and valued at 20 silver pence was also issued in 1257 but was not successful.

The English penny remained nearly unchanged from 800 and was a prominent exception in the progressive debasements of coinage which occurred in the rest of Europe. The Tower Pound, originally divided into 240 pence, devalued to 243 pence by 1279.
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