The first Carolingian-style pennies were introduced by King Offa of Mercia ( 757–796), modeled on Pepin's system. His first series was of the Saxon pound of , giving a pennyweight of about His queen Cynethryth also minted these coins under her own name. Near the end of his reign, Offa minted his coins in imitation of Charlemagne's reformed pennies. Offa's coins were imitated by East Anglia, Kent, Wessex and Northumbria, as well as by two Archbishops of Canterbury. As in the Frankish Empire, all these pennies were notionally fractions of shillings (; ) and pounds (; ) but during this period neither larger unit was minted. Instead, they functioned only as notional units of account. (For instance, a "shilling" or "solidus" of grain was a measure equivalent to the amount of grain that 12 pennies could purchase.) English currency was notionally .925-fine sterling silver at the time of Henry II, but the weight and value of the silver penny steadily declined from 1300 onwards.