Some of the Anglo-Saxon kingdoms initially copied the solidus, the late Roman gold coin; at the time, however, gold was so rare and valuable that even the smallest coins had such a great value that they could only be used in very large transactions and were sometimes not available at all. Around 641–670, there seems to have been a movement to use coins with a lower gold content. This decreased their value and may have increased the number that could be minted, but these paler coins do not seem to have solved the problem of the value and scarcity of the currency. The miscellaneous silver sceattas minted in Frisia and Anglo-Saxon England after around 680 were probably known as "pennies" at the time. (The misnomer is based on a probable misreading of the Anglo-Saxon legal codes.) Their purity varied and their weight fluctuated from about 0.8 to about 1.3 grams. They continued to be minted in East Anglia under Beonna and in Northumbria as late as the mid-9th century.