 These terms reflect translations of continental legal usage, and may well describe measures of value and/or weight rather than coins as such, yet nonetheless it is probable that the gold "tremisses" produced in 7th-century England were referred to as "scillingas".Over the course of the 7th century, the gold content of Anglo-Saxon and Frankish "tremisses" deteriorated until, in the 660s, they were often only 10-20% pure.Around this point, there was a major shift from debased gold to silver in Merovingian Frankia.